We took the kids over to the Denver Aquarium today, hoping to take advantage of the New Year holiday and hopefully hit no crowds. For this installment of Today I Learned, I was surprised to find out that a large school of piranha can apparently eat an entire cow in 3-4 minutes. 3. To. 4. Minutes. I’m not sure that a well coordinated pack of human beings could completely clean a carcass of a cow with proper butchering knives. I was a bit skeptical when I read this, but I did a little searching and it turns out that an account of this sort of cow-nivorous behavior (groan) was reported by none other than President Theodore Roosevelt on an expedition to Brazil. Sure, the fish has been corralled and starved for a few days, but hells bells man.