Louis Leakey

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.

In 1979, the Supreme Court ruled 5-3 in Smith v. Maryland that a few days' worth of phone records for a single individual were not protected by the Fourth Amendment. The NSA today, though, collects hundreds of millions of phone records from hundreds of millions of Americans without an individualized warrant.