The most formidable barrier in medicine is the one that separates the brain from the bloodstream. Some small, simple chemical compounds such as paracetamol can cross the blood–brain barrier, but for larger molecules, such as proteins and messenger RNA, it is completely impermeable. There is a good reason for this — toxins and pathogens swimming
WENDOVER, Utah — The first — and only — person to break the sound barrier in a car hits the track in Utah this week with new wheels and his eye on another record. Twenty years ago, British driver Andy Green set the land speed record for a diesel-powered car, reaching 350.092 mph (563.4 kph)
Spain on Saturday installed a 500-meter-long (1,600-foot) barrier on the sea border between its North African territory of Ceuta and neighboring Morocco after tens of thousands of migrants breached the frontier earlier in the week. At least 67 migrants died, including some who drowned and others who were killed in a stampede to cross a breakwater barrier, the Spanish
