Admittedly, the Sun is my usual celestial body of interest, but today I feel compelled to mention the Moon. Or rather, the tides that the Moon’s gravity creates here on Earth. Tidal power is an almost entirely untapped source of renewable energy in the United States. Almost. For the first time in history, tidal energy is contributing to the US power grid. On Thursday, Sept. 13, 2012, Ocean Renewable Power Company’s Maine Tidal Energy Project, using underwater turbines off the coast of Maine, delivered electricity to ~27 homes. Incremental developments in technology and our use of renewable energy like this are, I think, certainly cause for optimism re our evolution beyond fossil fuels. After all, small steps make for giant leaps. And we need a giant leap.