Every year on Earth Day, I try to go for a hike in the woods near my house. I look for tadpoles and admire the spring ephemerals.

Blimey, it's a bit taters this morning, innit?

When not otherwise noted, zero will mean positive zero here.

1986, Frederick Sanders, Monthly Weather Review, Volume 114, page 1781, Explosive Cyclogenesis in the West-Central North Atlantic Ocean, 1981–84. Part I: Composite Structure and Mean Behavior.