Scientists can't agree on why some autumn leaves go red

Too many rats? Birth control is one city's answer

This week's Short Wave news roundup

Scientists thought this fossil was a teen T. rex. Turns out it's a new tyrannosaur

An Alzheimer's pill appears to protect some in a high-risk population

A spider scientist makes the case for why we should love arachnids

Sheep, soldiers, and grains: Studying the physics of crowds

Coffee-driven deforestation is making it harder to grow coffee, watchdog group says

What killed Napoleon's army? Scientists find clues in DNA from fallen soldiers' teeth

Here's what experts say 'A House of Dynamite' gets wrong (and right) about nuclear war

This 'magical' dinosaur specimen emerged from the ground like a polished jewel

Scientists make yogurt using ants. The result: tangy and herby

Mental exercise can reverse a brain change linked to aging, study finds

Reversing peanut advice prevented tens of thousands of allergy cases, researchers say

Some ants appear to alter their nests to prevent epidemics

Earthworms may offer clues into magnetic navigation

This week in science: Smoking and memory, reading to premies, and an urban mystery

A classified network of SpaceX satellites is emitting a mysterious signal

Earthworm magnetic navigation Earthworms may offer clues into magnetic navigation

Scientists are genetically modifying wildlife. Should they be released in the wild?