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Napoleon Chagnon, 81, Controversial Anthropologist, Is Dead

SpaceX Unveils Silvery Vision to Mars: ‘It’s Basically an I.C.B.M. That Lands’

Elon Musk to Deliver SpaceX Starship Presentation

There Are Parasitic Wasps, and Then There’s the Crypt-Keeper

Joachim Messing, 73, Who Charted the DNA of Viruses and Plants, Dies

How Blink-182’s Tom DeLonge Became a U.F.O. Researcher

Cats Like People! (Some People, Anyway)

Where Theory Meets Chalk, Dust Flies

It’s a Dirty Job, but Someone Has to Do It and Not Get Eaten

The Most Powerful Lightning Bolts Strike in Unexpected Places

Hurricanes May Kill Some Birds, but Humans Are the Real Threat

Weather Radars Reveal an 80 Percent Chance of ... Dragonflies?

Beekeepers Confront the E.P.A. Over Pesticides

For Poison-Dart Frogs, Markings Matter When It Comes to Survival

In the South Pacific, a Humpback Whale Karaoke Lounge

Did India’s Chandrayaan-2 Moon Lander Survive? The Odds Are Long

Found in Maine: A 1-in-50 Million Lobster

What Painting With Your Feet Does to Your Brain

We’re Barely Listening to the U.S.’s Most Dangerous Volcanoes

How Does Antarctica’s Only Native Insect Survive Extreme Cold?

Chandrayaan-2: How to Follow India’s Moon Landing

Steven Gubser, a Bright Star in the Physics Universe, Dies at 47

How a Volcanic Eruption Set Off a Phytoplankton Bloom

How Did an Ancient Sea Turtle End Up Under a Dinosaur’s Foot?

A Creative Force in Understanding Genes

Sally Floyd, Who Helped Things Run Smoothly Online, Dies at 69

Squirrels Relax When They Hear Birds Relaxing

Behold Mortichnia, the Death Trail of an Ancient Worm

These High-Flying Geese Are ‘the Astronauts of the Bird World’

White Barn Owls Thrive When Hunting in Bright Moonlight