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Robert Jarvik, 79, Dies; a Designer of the First Permanent Artificial Heart

Your Cat May or May Not Love You, but It Knows Your Scent

These Plants Protect Larvae From Wildfires

Did Soccer Originate in Scotland? New Claim Draws Jeers in England.

Ed Smylie, Who Saved the Apollo 13 Crew With Duct Tape, Dies at 95

Richard L. Garwin, a Creator of the Hydrogen Bomb, Dies at 97

Interior Department Weighs Less Conservation, More Extraction

1 Astronaut, Many Cameras and 220 Days of Amazing Images From Space

In Their Final Moments, a Pompeii Family Fought to Survive

Soviet Spacecraft Crash Lands on Earth After a Journey of Half a Century

The Best Way to Drop an Egg

A Half-Ton Spacecraft Lost by the Soviets in 1972 Is Coming Home

How Trump’s Cuts Are Stifling L.G.B.T.Q. Health Research

Volcanic Eruption in Deep Ocean Ridge Is Witnessed by Scientists for First Time