Space exploration and travel
Five space travelers had elevated levels of proteins in the blood often seen in people with head trauma and neurodegenerative diseases.
New research suggests gamma rays stunt plant growth.
Cave microbes on Earth may help guide scientists toward life on Mars.
Sunscreen and calcium supplements aren't enough to protect Mars-bound space travelers from radiation and a lack of gravity in outer space.
Greek mythology says Icarus fell because he flew too close to the sun. What does science say?