Author Stephen Petranek says within the next 20 years humans will live on Mars. The race to get there, how to make it habitable and other big questions about traveling to and living on this next frontier.
A recent U.S. Court of Appeals ruling may do away with the 108-year-old requirement that "sightseeing tour guide"s in the District be licensed. Some professional and part-time guides are sorry to see the requirement go, while others say good riddance - we hear from both sides.
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