Volunteer collecting garbage from park

The Problem with Unpaid Conservation Work

In the fight against climate change, many underfunded conservation groups depend on volunteers.
Photograph: Icicles hang off the  State Highway 195 sign on February 18, 2021 in Killeen, Texas.

Source: Joe Raedle/Getty

Extreme Cold and Public Opinion on Climate Change

To some, the idea that the Earth is warming seems incompatible with how they experience cold weather events.
Karate chop

The Physics of Karate

A human hand has the power to split wooden planks and demolish concrete blocks. A trio of physicists investigated why this feat doesn't shatter our bones.
Paradisaea rubra

Charles Darwin’s Descent of Man, 150 Years Later

A new book on Darwin’s classic asks what he got right and wrong about “the highest and most interesting problem for the naturalist:” human evolution.
An illustration of digital viruses

Do Viruses Cheat to Win at Evolution?

How one pair of researchers used game theory to predict the sneaky, underhanded behavior of microbial competitors.
Cinnamomum verum

Plant of the Month: Cinnamon

Of early modern medicinal monopolies and the nature of a "true" product of empire.
An artist concept of a NASA astronaut on Mars

Why Hasn’t NASA Sent Anyone to Mars?

The Perseverance mission to Mars represents a considerable step forward for the space program. But are rovers as good as it gets?
Annie Montague Alexander

Annie M. Alexander: Paleontologist and Silent Benefactor

An unsung patron of science whose deep pockets and passion for exploring led to the founding of two influential natural history museums.
An image of the uterus and womb, 1908

The “Scientific” Antifeminists of Victorian England

Nineteenth-century biologists employed some outrageous arguments in order to keep women confined to the home.
Eric LoPresti

Some Plants Use Stickiness to Fend off Hungry Insects

For some sand-dwelling plants, stickiness is a defense tactic that keeps predators at bay.