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What's best for baking—butter or margarine? A food scientist explains

Key differences in the chemical structure of butter and margarine mean choosing one or the other has a big effect on your baking

Medical Journal Retracts Study Claiming Cancer Therapy Is More Effective When Given in the Morning

REBECCA ROBBINS

In a notice flagging a series of problems with a clinical trial, the journal Nature Medicine said its editors “no longer have confidence in the integrity of the results.”

How to protect Earth from a deadly asteroid impact

Our solar system is a celestial shooting gallery, chock-full of flying projectiles that one day could threaten Earth—so what can we do about it?

This Trap Wants Ants to Take a Bite

K. R. CALLAWAY

Named for an ancient Roman crossbow-like weapon, the newly found “ballista” spider uses a springy snare to catch prey.

How to tell a comet from an asteroid and a meteor from a meteorite

A field guide to the space rocks you might see streaking across the night sky