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Math

Captcha the Puzzle

A computer creates a test that it can't pass but most people can.

Humans

From the April 13, 1935, issue

A giant meteorite discovered in Kansas, gasoline made from coal in Germany, and elastic rock layers deep in the earth.

Math

Paper Enigma

The enigma machine was used by Germany during World War II to encrypt and decrypt messages. Created by Mike Koss, the plans and detailed instructions offered on these Web pages allow you to build your own fully functioning, paper version of this infamous machine. Go to: http://mckoss.com/Crypto/Enigma.htm

Earth

Rice with a Human Touch: Engineered grain uses gene from people to protect against herbicides

A human gene inserted into rice enables that plant to break down an array of chemicals used to kill weeds.