A young river otter has been christened Sutro Sam after he moved into the Sutro Baths, an abandoned ruin of a 19th-century spa complex on San Francisco's Pacific coast, just north of Golden Gate Park. Sutro Sam is San Francisco's only river otter; the theory is that he swam down south from Marin County, where there are larger populations of river otters, and stayed because the Sutro Baths are an excellent hangout spot for an otter. He's got fresh water in the baths, salt water in the ocean, and lots of giant goldfish people have placed into the Baths, which Sam apparently "eats like potato chips." He'll probably stay until the food's gone, or until he feels like leaving. [SFGate]
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.