According to the standard model of cosmology, that expansion rate should be the same no matter how you measure it. But in recent years, scientists have found that the expansion rate of the early universe and that of the more recent universe vary by approximately 9 percent. That discrepancy, or tension, “has provoked heated debates
Electrons travel across the bulb to a collector plate, which creates the output current. Now, it might seem like a silly way to do that. But if we add another wire (a grid) between the filament and the collector, we can control this output current. A negative voltage on the control will push the electrons
You’re walking the dog at night, and your little flashlight, which has been getting dimmer, conks out. Instead of stumbling home in the dark, wouldn’t it be great if you could somehow eke a little more energy out of the batteries inside? That’s not as crazy as it sounds. When a battery-powered device stops working,
Entropy is a of the most maligned and misunderstood concepts in science. You may have heard it defined as the “amount of disorder” in a system. And the second law of thermodynamics says that the entropy of a closed system always increases with time. So you might think, why should you clean your office if
