There’s enough hot rock to fill the Grand Canyon nearly 14 times.

Once, while fishing for salmon, I hooked a clam. It fought bravely, and when I finally pulled it from the water I could see that I hadn’t just snagged it, as you might expect, but that it had taken the bait willingly. These are minor points; what matters here is that the clam, so different […]

Imagine that a loved one, let’s say your brother, has suffered a serious brain injury. After languishing in a coma, he finally “emerges”—that is, he cycles between sleep and wakefulness, yanks his hand away when it’s pricked, is startled by loud noises, and so on. But it’s not clear that he’s ever truly awake; his […]

This classic Facts So Romantic post was originally published in September, 2013. Roughly twice a year, the apparent positions of sun and moon coincide, and a fortunate few observers are treated to a solar eclipse. Watching such an event provides the opportunity to contemplate a strange coincidence: From the surface of Earth, the apparent sizes […]

How a homemade piece of lab equipment is recreating chemical evolution on early Earth.

Santiago Ramón y Cajal recorded his dreams to prove Freud wrong.