Matt Carr, the CEO and cofounder of Agsol, the company that designed Wanjiru’s mill, is here with me, visiting to get her feedback on his product. One issue bothers her. “It can be slow,” Wanjiru ...

As of Monday, June 8, Instagram users will be able to rearrange their profile grids (their photos and videos) however they please. Previously, posts only appeared in chronological ...

The result is correct but challenges core norms of mathematics: checking proofs, crediting ideas and keeping research open to everyone.