Astronomers say a distant, sunlike star shows signs of a catastrophic planet-on-planet crash that may mirror the ancient impact that formed Earth's moon. When you purchase through links on our site, ...

"At first, I kind of laughed … But they were serious. I could just see the seriousness in their faces." In this book excerpt, Lise Barnéoud explores the limitations of DNA testing. When you purchase ...

Scientists once thought illness was caused by “miasmas,” foul vapors that drifted through the air. For centuries, they were certain that the sun rotated around the Earth. Until the 1950s, they ...

There is something humbling about realizing that the most urgent climate questions we wrestle with today were, in many ways, already being answered decades ago. Scientists, policymakers, and ordinary ...

This crossword is inspired by the most recent issue of Scientific American. Read it here. Print readers, check your answers by selecting “Assist” above and then “Reveal Grid” or by selecting “Print” ...