{"id":1359,"date":"2026-03-03T15:53:35","date_gmt":"2026-03-03T15:53:35","guid":{"rendered":"https:\/\/owspakistan.com\/?p=1359"},"modified":"2026-03-05T01:24:11","modified_gmt":"2026-03-05T01:24:11","slug":"oracle-of-delphi-drugs","status":"publish","type":"post","link":"https:\/\/owspakistan.com\/?p=1359","title":{"rendered":"Ancient Greece&#8217;s most famous oracle was just high on gas fumes"},"content":{"rendered":"<div>\n<section class=\"recurrent-blocks recurrent-newsletter-block recurrent-newsletter-email-block recurrent-newsletter-email-block-on-top pw-incontent-excluded flipboard-remove \">\n<div class=\"container newsletter-container\">\n<div class=\"newsletter-content\">\n<h2 class=\"newsletter-cta-title\"> <\/h2>\n<p class=\"article-paragraph skip\">Get the Popular Science daily newsletter\ud83d\udca1<\/p>\n<div class=\"newsletter-cta-description\">\n<p class=\"article-paragraph skip\"><span style=\"font-weight: 400\">Breakthroughs, discoveries, and DIY tips sent six days a week.<\/span><\/p>\n<\/p><\/div><\/div><\/div>\n<\/section>\n<p class=\"has-drop-cap pw-incontent-excluded article-paragraph skip\">For centuries, people traveled to Delphi in southern Greece hoping for a glimpse of their future. There, at the temple of the god Apollo, a priestess was said to enter a trance and issue prophecies in the voice of Apollo himself. Everyday people, kings, even Alexander the Great traveled for miles to hear the priestess\u2019s input on important decisions, from personal finance to matters of state. <\/p>\n<p class=\"article-paragraph skip\">Known as the <em>Pythia<\/em> or the Oracle of Delphi, the priestess wasn\u2019t believed to be a psychic. Ancient writers like Plutarch, who served as a priest at Delphi in the first and second centuries, described her as a vessel for a power that came <a href=\"https:\/\/www.nytimes.com\/2002\/03\/19\/science\/for-delphic-oracle-fumes-and-visions.html\" rel=\"noreferrer noopener\" target=\"_blank\">from the Earth<\/a>.\u00a0<\/p>\n<p class=\"article-paragraph skip\">According to Plutarch\u2019s account, the temple of Delphi was constructed around a natural spring, where the water and fissures in the rock produced a sweet-smelling gas called <em>pneuma<\/em>. On designated days a few times per year, the chosen priestess sat amidst the pneuma on a tripod stool and inhaled enough <a href=\"https:\/\/www.biblicalarchaeology.org\/daily\/ancient-cultures\/daily-life-and-practice\/the-oracle-of-delphi-was-she-really-stoned\/\" rel=\"noreferrer noopener\" target=\"_blank\">to enter her trance<\/a>. This was an exhausting ordeal for the woman. She might cry out, become hysterical, or collapse.<\/p>\n<p class=\"article-paragraph skip\">Plutarch claimed that there was less pneuma in his time than there had once been, leading to a decline in the temple\u2019s popularity. After the temple closed down in 393 AD, the pneuma remained an enduring scientific puzzle. Was the trance-inducing vapor real? And if so, what exactly was it, and where had it come from?<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-decoding-ancient-sources-for-clues\">Decoding ancient sources for clues<\/h2>\n<p class=\"article-paragraph skip\">The first modern <a href=\"https:\/\/www.popsci.com\/category\/archaeology\/\" target=\"_blank\" rel=\"noopener\">excavations<\/a> at Delphi, conducted between 1892 and 1950, failed to find a large fissure in the rock, which they had pictured as the source of the gas. At the time, experts believed that gases could only rise from the Earth in connection with volcanoes, which Delphi doesn\u2019t have. This led scholars to dismiss the ancient accounts as hearsay. However, subsequent investigations came to a very different conclusion, spurred on by the words of the ancient authors.\u00a0<\/p>\n<p class=\"article-paragraph skip\">\u201cWhen I\u2019ve got written sources from the ancient world, my first effort is, \u2018What can I learn from them?\u2019\u201d archaeologist <a href=\"https:\/\/ohc.library.louisville.edu\/interviewees\/1129\" rel=\"noreferrer noopener\" target=\"_blank\">John Hale<\/a> tells <em>Popular Science<\/em>. In the 1990s, Hale and a multidisciplinary team of researchers finally uncovered scientific evidence that corroborated the ancient descriptions of Delphi.\u00a0<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-shifting-tectonic-plates-can-cause-gases-to-rise-from-the-earth-0\">Shifting tectonic plates can cause gases to rise from the Earth<\/h2>\n<p class=\"article-paragraph skip\">Hale explains that his colleague, Dutch-American geologist Jelle Zeilinga de Boer, had noticed a fault line passing under the temple of Delphi during a 1980s surveying project. Fault lines are places where two of the Earth\u2019s tectonic plates bump against one another. The plates\u2019 movement can cause earthquakes and other forms of geological activity, including the emission of gases.\u00a0<\/p>\n<p class=\"article-paragraph skip\">De Boer wondered if the ancient pneuma at Delphi was \u201ca light hydrocarbon gas\u201d that rose from the permeable limestone under the temple, says Hale.\u00a0<\/p>\n<p class=\"article-paragraph skip\">Hydrocarbons are compounds made entirely of carbon and hydrogen. A fundamental component of living things, they also occur in <a href=\"https:\/\/www.popsci.com\/category\/fossil-fuels\/\" target=\"_blank\" rel=\"noopener\">fossil fuels<\/a> like petroleum. Such chemicals \u201care found in a lot of geological formations all over the planet,\u201d says Hale. \u201cThey\u2019re part of the mix of the Earth\u2019s crust.\u201d\u00a0<\/p>\n<p class=\"article-paragraph skip\">When two tectonic plates rub against each other along a fault line, they produce friction, which can generate enough heat to convert those solid hydrocarbons in the Earth\u2019s crust into gas. And if there\u2019s enough holes or channels in the Earth, that gas can rise to the surface, similar to what ancient authors described at Delphi.\u00a0<\/p>\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-9-16 wp-has-aspect-ratio wp-embed-aspect-9-16 wp-has-aspect-ratio has-caption is-lazied\">\n<div class=\"lazied-youtube-frame\" data-video-id=\"fCU_UOAtK-Y\" data-start-time=\"0\" data-iframe-classes=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-9-16 wp-has-aspect-ratio wp-embed-aspect-9-16 wp-has-aspect-ratio has-caption\">\n\t\t<img decoding=\"async\" class=\"lazied-youtube-frame-thumbnail\" loading=\"lazy\" src=\"https:\/\/i.ytimg.com\/vi\/fCU_UOAtK-Y\/hqdefault.jpg\"\/><\/p>\n<p>\n\t\t\t\tInsane Natural Gas Discovery in the Wild!\t\t\t<\/p>\n<p>\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"lazied-youtube-frame-icon\" viewbox=\"0 0 68 48\">\n\t\t\t<path d=\"M66.52 7.74c-.78-2.93-2.49-5.41-5.42-6.19C55.79.13 34 0 34 0S12.21.13 6.9 1.55c-2.93.78-4.63 3.26-5.42 6.19C.06 13.05 0 24 0 24s.06 10.95 1.48 16.26c.78 2.93 2.49 5.41 5.42 6.19C12.21 47.87 34 48 34 48s21.79-.13 27.1-1.55c2.93-.78 4.64-3.26 5.42-6.19C67.94 34.95 68 24 68 24s-.06-10.95-1.48-16.26z\" fill=\"red\"\/>\n\t\t\t<path d=\"M45 24 27 14v20\" fill=\"white\"\/>\n\t\t<\/svg>\n\t<\/div><figcaption class=\"wp-element-caption\">When tectonic plates shift, hydrocarbons, such as methane and ethane, can rise to the Earth\u2019s surface. <em>Video: Insane Natural Gas Discovery in the Wild! \/ <a href=\"https:\/\/www.youtube.com\/shorts\/fCU_UOAtK-Y\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">@CrafterDUCK<\/a><\/em><\/figcaption><\/figure>\n<p><noscript><\/p>\n<p><iframe title=\"Insane Natural Gas Discovery in the Wild!\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/fCU_UOAtK-Y?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><br \/>\nWhen tectonic plates shift, hydrocarbons, such as methane and ethane, can rise to the Earth\u2019s surface. Video: Insane Natural Gas Discovery in the Wild! \/ @CrafterDUCK<br \/>\n<\/noscript><\/p>\n<h2 class=\"wp-block-heading\" id=\"h-testing-delphi-s-bedrock-for-prophetic-fumes\">Testing Delphi\u2019s bedrock for prophetic fumes<\/h2>\n<p class=\"article-paragraph skip\">Early excavations at Delphi discovered a porous limestone bedrock far below the temple. That stone could provide the necessary, near-invisible channels for the flow of gases to reach ground level and, in turn, a waiting priestess\u2019s lungs.\u00a0<\/p>\n<p class=\"article-paragraph skip\">But there was no evidence of a hydrocarbon deposit at the site. Together, Hale and De Boer decided to see if Delphi\u2019s limestone really did contain these compounds. If found, they might represent the final piece of the puzzle.<\/p>\n<p class=\"article-paragraph skip\">In 1996, after gaining permission from the Greek government, Hale and De Boer made their first expedition to Delphi. They took samples of the bedrock and sent them to a lab for analysis. As they suspected, the porous limestone was rich in hydrocarbons, such as ethane, methane, and ethylene.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-what-exactly-was-the-oracle-of-delphi-inhaling\">What exactly was the Oracle of Delphi inhaling?<\/h2>\n<p class=\"article-paragraph skip\">Ethylene is a hydrocarbon and one of the world\u2019s most widely-produced <a href=\"https:\/\/www.afpm.org\/newsroom\/blog\/ethylene-worlds-most-important-chemical\" rel=\"noreferrer noopener\" target=\"_blank\">organic compounds<\/a>. In industry, it\u2019s a building block for plastics. In agriculture, it\u2019s used to induce ripening in fruit. (Have you ever put a green banana in a paper bag to make it ripen faster? Fruit releases ethylene to encourage its own ripening, which builds up inside the bag). In the past, ethylene gas was even used as <a href=\"https:\/\/www.popsci.com\/health\/how-does-anesthesia-work\/\" target=\"_blank\" rel=\"noopener\">a surgical anesthetic<\/a>, because inhaling it at a concentration of 20 percent causes unconsciousness.\u00a0<\/p>\n<p class=\"article-paragraph skip\">But what happens if someone inhales a lower, though still highly-concentrated, dose? To find out, Hale and De Boer turned to toxicologist Henry Spiller, due to his research on \u201chuffing,\u201d the inhalation of hydrocarbons and other toxic gases for recreation.\u00a0<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-what-does-inhaling-ethylene-do-to-a-person\">What does inhaling ethylene do to a person?<\/h2>\n<p class=\"article-paragraph skip\">Spiller found many parallels between the altered state of mind produced by ethylene inhalation and ancient accounts of the Pythia\u2019s trance. People under the influence of ethylene remain lucid and responsive, but may <a href=\"http:\/\/www.religionandnature.com\/ern\/sample\/Hale--DelphicOracle.pdf\" rel=\"noreferrer noopener\" target=\"_blank\">speak or behave strangely<\/a>. They may become agitated, scream, or convulse, and may be unable to remember what happened after the gas wears off. Hale calls ethylene \u201ca perfect match\u201d for <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/12126194\/\" rel=\"noreferrer noopener\" target=\"_blank\">the ancient pneuma<\/a>. Ethylene even smells sweet, just as Plutarch described.\u00a0<\/p>\n<p class=\"article-paragraph skip\">Repeated inhalation of gases like ethylene carries serious health risks. Plutarch noted that inhaling the gas shortened the priestess\u2019s lives and could even kill them on rare occasions. At the temple\u2019s height, multiple women shared the office of oracle because of how physically demanding it was to enter the trance state. Being Pythia was considered a great honor, but it was also a burden.\u00a0<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"2048\" height=\"1297\" loading=\"lazy\" src=\"https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?strip=all&amp;quality=85\" alt=\"A wide-angle landscape photograph of the ancient ruins of the Temple of Apollo in Delphi, Greece. The stone foundations and several standing Doric columns are situated on a steep mountain slope under a bright, partly cloudy sky, overlooking a lush green valley.\" class=\"wp-image-745830\" srcset=\"https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=50&amp;h=32 50w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=280&amp;h=177 280w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=289&amp;h=183 289w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=308&amp;h=195 308w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=341&amp;h=216 341w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=370&amp;h=234 370w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=580&amp;h=367 580w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=625&amp;h=396 625w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=632&amp;h=400 632w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=660&amp;h=418 660w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=768&amp;h=486 768w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1024&amp;h=649 1024w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1096&amp;h=694 1096w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1152&amp;h=730 1152w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1187&amp;h=752 1187w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1250&amp;h=792 1250w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1320&amp;h=836 1320w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1440&amp;h=912 1440w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1536&amp;h=973 1536w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=1615&amp;h=1023 1615w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/Ancient-Temple-of-Apollo-in-Delphi-Greece-where-the-famous-Oracle-of-Delphi-was-located.jpg?w=2048 2048w\" sizes=\"auto, (max-width: 2048px) 100vw, 2048px\"\/><figcaption class=\"wp-element-caption\">The Oracle of Delphi would utter her prophecies from inside the Temple of Apollo in Delphi, Greece (shown here). <em>Image: Federica Grassi \/ Getty Images<\/em> Federica Grassi<\/figcaption><\/figure>\n<h2 class=\"wp-block-heading\" id=\"h-why-ethylene-comes-to-the-surface\">Why ethylene comes to the surface<\/h2>\n<p class=\"article-paragraph skip\">Today, we know that shifting tectonic plates can produce gases even when a volcano is not present. And, if there are channels up to ground level, those gases only have one direction to go: up.<\/p>\n<p class=\"article-paragraph skip\">\u201cEthylene is one of those lighter-than-air gases that comes straight to the surface if it\u2019s being emitted,\u201d Hale explains, rising through openings like those in the porous limestone at Delphi. And after that, Hale adds, the gas \u201ccan be huffed by anybody who\u2019s on top and put them in an altered state.\u201d\u00a0<\/p>\n<p class=\"article-paragraph skip\">Early excavations at Delphi were looking for one big chasm in the rocks. The most recent evidence suggests that gas actually seeped through many small openings, following the paths made by spring water. Hydrocarbons have also been found in the water at Delphi itself, and some still rises from groundwater as gas today; enough to occasionally kill birds <a href=\"https:\/\/www.jstor.org\/stable\/26060404\" rel=\"noreferrer noopener\" target=\"_blank\">that come too close<\/a>.\u00a0<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1893\" height=\"4001\" loading=\"lazy\" src=\"https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?strip=all&amp;quality=85\" alt=\"An 1891 oil painting by John Collier titled &quot;Priestess of Delphi.&quot; A woman sits in a trance upon a tall, three-legged bronze stool over a chasm in the floor from which white vapor rises. She holds a laurel branch in one hand and a shallow bowl in the other, her head draped in a red cloth.\" class=\"wp-image-745829\" srcset=\"https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=24&amp;h=50 24w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=102&amp;h=216 102w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=175&amp;h=370 175w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=187&amp;h=396 187w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=189&amp;h=400 189w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=191&amp;h=404 191w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=280&amp;h=592 280w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=289&amp;h=611 289w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=308&amp;h=651 308w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=312&amp;h=660 312w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=326&amp;h=690 326w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=328&amp;h=694 328w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=356&amp;h=752 356w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=396&amp;h=836 396w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=484&amp;h=1023 484w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=545&amp;h=1152 545w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=565&amp;h=1195 565w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=568&amp;h=1200 568w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=591&amp;h=1250 591w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=727&amp;h=1536 727w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=768&amp;h=1623 768w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg?w=969&amp;h=2048 969w, https:\/\/www.popsci.com\/wp-content\/uploads\/2026\/02\/John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg 1893w\" sizes=\"auto, (max-width: 1893px) 100vw, 1893px\"\/><figcaption class=\"wp-element-caption\">Archaeologists now know that the Oracle of Delphi didn\u2019t inhale fumes from a single fissure, but instead inhaled fumes from invisible channels within the porous limestone beneath the Temple of Apollo. <em>Image: <a href=\"https:\/\/commons.wikimedia.org\/wiki\/File:John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg#\/media\/File:John_Collier_-_Priestess_of_Delphi_-_Google_Art_Project.jpg\" target=\"_blank\" rel=\"noreferrer noopener\">Public Domain<\/a><\/em> <\/figcaption><\/figure>\n<h2 class=\"wp-block-heading\" id=\"h-what-makes-delphi-unique\">What makes Delphi unique<\/h2>\n<p class=\"article-paragraph skip\">Hale notes that the physical site of Delphi was recognized as unique in the ancient world. It was not the only temple where an oracle claimed to foretell the future, but \u201cit\u2019s the only one that ever mentioned a sweet-smelling gas as part of the sacred experience,\u201d he says.\u00a0<\/p>\n<p class=\"article-paragraph skip\">When compared with other Greek temples, Delphi was likely designed to enclose the spring, allowing gas to accumulate in the inner chamber where the Pythia sat. Other Greek temples may not have had vapor-inhaling oracles, but many were also positioned over sites of high geological activity, such as the temple at the ancient city of Hierapolis (modern Pamukkale, Turkey). There, carbon dioxide rather than ethylene rises from the Earth, which was also used in ancient religious rites to <a href=\"https:\/\/www.science.org\/content\/article\/roman-gate-hell-killed-its-victims-cloud-deadly-carbon-dioxide\" rel=\"noreferrer noopener\" target=\"_blank\">kill sacrificial animals<\/a>.<\/p>\n<p class=\"article-paragraph skip\">We know from Hierapolis and similar sites that the water which carries gases to the surface also deposits minerals. This may gradually clog the channels in the stone, so that less gas reaches the surface over time. Earthquakes, which occurred at Delphi even in ancient times, might also lead to changes in the pathways for the gas. An earthquake might close previously open channels for ethylene or release a large buildup of it at once. So while we can\u2019t know for certain, there may be a geological explanation for Plutarch\u2019s assertion that the pneuma declined over time.<\/p>\n<p class=\"article-paragraph skip\">Today, Delphi\u2019s unique geology is far from inactive. Gases can still rise from the porous limestone beneath the temple ruins, serving as a very real connection between us and our ancient ancestors.\u00a0<\/p>\n<p class=\"article-paragraph skip\"><em>In <\/em><a href=\"https:\/\/www.popsci.com\/that-time-when-series\/\" target=\"_blank\" rel=\"noopener\"><em>That Time When<\/em><\/a><em>, Popular Science tells the weirdest, surprising, and little-known stories that shaped science, engineering, and innovation.<\/em>\u00a0<\/p>\n<section id=\"\" class=\"recurrent-article-aside-block recurrent-blocks pw-incontent-excluded \">\n<p><h2 class=\"article-aside-title\">\n\t\t\t\tOther &#8216;That Time When&#8217; Stories\t\t\t<\/h2>\n<\/p>\n<\/section>\n<section class=\"content-widget content-widget--large pw-incontent-excluded\">\n<p>\t<span class=\"block bg-secondary-300 h-2 w-16 mt-10 mb-8\">\u00a0<\/span><\/p>\n<div class=\"flex flex-col md:flex-row items-start justify-items-start\">\n<div class=\"mb-4 md:mb-0 md:w-4\/12 w-full\">\n\t\t\t\t<img decoding=\"async\" width=\"300\" height=\"169\" src=\"https:\/\/www.popsci.com\/wp-content\/uploads\/2025\/12\/best-of-whats-new-2025-HERO.png?quality=85&amp;w=300\" class=\"max-w-[100%]\" alt=\"products on a page that says best of what's new 2025\" srcset=\"https:\/\/www.popsci.com\/wp-content\/uploads\/2025\/12\/best-of-whats-new-2025-HERO.png?w=50&amp;h=28 50w, https:\/\/www.popsci.com\/wp-content\/uploads\/2025\/12\/best-of-whats-new-2025-HERO.png?w=280&amp;h=158 280w, https:\/\/www.popsci.com\/wp-content\/uploads\/2025\/12\/best-of-whats-new-2025-HERO.png?w=289&amp;h=163 289w\" sizes=\"(max-width: 300px) 100vw, 300px\"\/>\t\t\t<\/div>\n<div class=\"ml-0 md:ml-10 md:w-8\/12 w-full\">\n<h3 class=\"wp-block-heading\">\n\t\t\t\t<\/h3>\n<p>2025 PopSci Best of What\u2019s New<\/p>\n<div class=\"content-widget-content mb-4\">\n<div id=\"1737663310.940689\" class=\"c-virtual_list__item\" role=\"listitem\" data-qa=\"virtual-list-item\" data-item-key=\"1737663310.940689\">\n<div class=\"c-message_kit__background c-message_kit__background--hovered p-message_pane_message__message c-message_kit__message\" role=\"presentation\" data-qa=\"message_container\" data-qa-unprocessed=\"false\" data-qa-placeholder=\"false\">\n<div class=\"c-message_kit__hover c-message_kit__hover--hovered\" role=\"document\" data-qa-hover=\"true\">\n<div class=\"c-message_kit__actions c-message_kit__actions--above\">\n<div class=\"c-message_kit__gutter\">\n<div class=\"c-message_kit__gutter__right\" role=\"presentation\" data-qa=\"message_content\">\n<div class=\"c-message_kit__blocks c-message_kit__blocks--rich_text\">\n<div class=\"c-message__message_blocks c-message__message_blocks--rich_text\" data-qa=\"message-text\">\n<div class=\"p-block_kit_renderer\" data-qa=\"block-kit-renderer\">\n<div class=\"p-block_kit_renderer__block_wrapper p-block_kit_renderer__block_wrapper--first\">\n<div class=\"p-rich_text_block\" dir=\"auto\">\n<div class=\"p-rich_text_section\">\n<p class=\"article-title\">The 50 most important innovations of the year<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div><\/div><\/div>\n<p>\t<span class=\"block bg-secondary-300 h-2 w-16 mt-8 mb-10\">\u00a0<\/span><\/p>\n<\/section>\n<footer class=\"article-content-footer lg:max-w-[730px] lg:mx-auto\">\n<div class=\"pw-incontent-excluded\">\n<section id=\"author-widgets\" class=\"recurrent-author-widgets pw-incontent-excluded\">\n<section class=\"recurrent-author-widget recurrent-primary-author-widget pw-incontent-excluded\">\n<p>Andrew&#8217;s work has appeared in <em>Atlas Obscura<\/em> and <em>Eaten<\/em> magazine.<\/p>\n<\/section>\n<hr class=\"author-divider\"\/>\n\t\t\t\t\t\t\t\t\t\t\t<\/section><\/div>\n<\/footer><\/div>\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Get the Popular Science daily newsletter\ud83d\udca1 Breakthroughs, discoveries, and DIY tips sent six days a week. 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