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In the 1930s, seismologists faced a big mystery about the inner structure of the Earth. Today, on what would have been Danish seismologist Inge Lehmann's 127th birthday, it's a good time to appreciate how - using limited data and rudimentary technology - she brilliantly arrived at the answer.

There's a lot of good information and visuals about population and emergent technologies in this letter, and it has a cool layout. Definitely worth reading.

Jackson, Wyoming, is an unlikely place for urban farming: At an altitude over a mile high, with snow that can last until May, the growing season is sometimes only a couple of months long. It's also an expensive place to plant a garden, since an average vacant lot can cost well over $1 million.