"I don't know why you're on Mars, but whatever the reason for going to Mars is, I'm glad you're there and I wish I was with you."
That was a part of astrophysicist Carl Sagan's message, recorded a few months before he died in 1996, to the future human inhabitants of Mars.
Some of the earliest science fiction imagined voyages to the Red Planet. We now have the space-faring technology, and getting humans to Mars actually seems within reach. It would certainly involve massive resources and a lot of danger, but some believe the rewards would be massive.
Saying that his state must take steps to plan for prolonged water shortages, Gov. Jerry Brown declared a state of emergency over an extended drought Friday. California faces "water shortfalls in the driest year in recorded state history," according to the governor's office.