Examine boundaries between science and ethics as scientists work with genetic testing and discovery.

Asteroid strikes get all the coverage, but "Medea Hypothesis" author Peter Ward argues that most of Earth's mass extinctions were caused by lowly bacteria. The culprit, a poison called hydrogen sulfide, may have an interesting...

Shielded by our thick skulls and swaddled in layers of protective tissue, the human brain is extremely difficult to observe in action. Madeline Lancaster shares how to make a brain in a lab.

This collection uses primary sources to explore the polio epidemic and vaccine.