Here's a fun fact: Since my open-heart surgery and valve replacement, I've been taking an anticoagulant drug known generically as warfarin. It's been used to help prevent blood clots since the 1950s. I just found out it was invented in the 1940s and originally used to kill rats. They would eat it and their blood would not clot and they would bleed to death. And that's what I have to take every day for the rest of my life. Rat poison.