Several important things happened on April 19, but here’s one of which I was unaware: Charles Darwin died on this date in 1882.
It came to my attention because the bookmark of the hour happens to be the Darwin-L archives. Darwin-L (1993-7) was a forum devoted to the historical sciences, full of tasty wide-ranging discussion. I was very sorry to see it close down.
How many list-servers, I wonder, still use the -L tag?