Plus: Elon Musk's team has pinned its cost-cutting hopes on AI This is today's edition of The Download, our weekday newsletter that provides a daily dose of what's going on in the world of technology.

The universe is packed with riddles, but few are as stubborn or as fascinating as dark matter. First proposed in 1933 by astronomer Fritz Zwicky, this elusive substance refuses to play by the rules: ...

A new study says observations from the NASA Fermi space telescope suggest a halo of dark matter around the center of our galaxy, but more information is needed to confirm the result. When you purchase ...