Uncategorized

Earth

Changes in the Air

Changes in the atmospheric concentration of oxygen through geologic time, some gradual and some drastic, have strongly shaped evolution among many types of creatures.

Math

Surface Story

Mathematicians have zeroed in on a new type of minimal surface based on a double helix.

Math

Parking Space Roulette

What's the best strategy for finding a good parking spot quickly?

Humans

From the December 7, 1935, issue

Indian art at Boulder Dam, ice under pressure, and vitamin A's role in vision.