1.6 day old moon
2.9 percent lit
March 14 was Pi Day.
3.14159265359. (click here) If you've never seen this number, it's first few digits of the mathematical constant π (pi). And why is that interesting? Pi is the ratio of the circumference, the length around a circle, to its diameter, the length across a circle. When you do the math, you get a number that's slightly greater than 3. Since circles are fundamental to everything from building construction to quantum physics, pi sees a lot of use....
