Subrahmanyan Chandrasekhar
Monday Open Thread; August 21 is "The Great American Eclipse"
Submitted by enhydra lutris on Mon, 08/21/2017 - 5:00am![](https://farm2.staticflickr.com/1493/26212496565_b2b949e0a3.jpg)
August 21 is the 233rd day of the year. There are 132 days left.
Today's number is 21
21 is the product of 2 primes, 7 and 3