The crushed-up soda can disappears in a cloud of steam and-though it's not visible-hydrogen gas. I can just keep this reaction going by adding more water," says Peter Godart, squirting some into the steaming beaker. This is room-temperature water, and it's immediately boiling. Doing this on your stove would be slower than this." Godart is...

This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. This startup is about to conduct the biggest real-world test of aluminum as a zero-carbon fuel Found Energy, a startup in Boston, aims to harness the energy in scraps of aluminum metal to...