A company has developed an engine oil made from beef tallow, which is currently sold for two- and four-cycle engines and auto racing, but is pending approval for use in cars. I'm curious, though, how beef tallow is otherwise used or disposed of. If you know, post a comment below.
Also in today's links: communities plot their futures, and how we know your best judgment prompted you to read this. Plus, amazing pictures.
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.