Archives for December 17, 2012

Ebb And Flow Crash Into Sally Ride!

Ebb and Flow were the twin space craft that mapped in the Moon’s gravitational field by flying near each other, and then as the gravity of the Moon tugged on them they could suss out how much gravity that was, exactly. The gravity map of the moon, actually two of them, at two different scales,…

I remember finding out about the Tethys Sea and being really excited. I was just beginning my studies of Old World prehistory, Africa, and Human Evolution. What I learned about was the remnant sea separating Africa and Eurasia called Tethys, though it is much more than that (see below). Imagine a Eurasia with no Alps,…

Let me start with this. People talking about Sandy Hook need to stop saying that “20 children between the ages of 5 and 10 were killed.” That is technically true but misses an enormously important point and indicates that you really haven’t thought this through. All of the children who were killed were born between…