There's added help for more than 70 different concepts from math and science, primarily from high school and college-level courses. The concepts come from algebra, geometry, calculus and physics. It's ...

Chinedu Ekuma once pioneered a more efficient way to make solar panels. Now he’s fighting to stay out of prison.

Mulugeta Bekele is almost single-handedly responsible for having kept Ethiopian physics going in the 1970s and 1980s despite being imprisoned and tortured by the Ethiopian military. Robert P Crease ...