100 Years since the Halifax Explosion Yesterday was the anniversary of the Halifax Explosion, the largest manmade non-nuclear explosion in history. This video breaks down how it happened. Trending GoPro Equipped Cheetah Goes on the Hunt! This is a first-person video of a cheetah on the hunt. Don't you wish you could run that fast?! Math Teacher Beats Calculator The math teacher has a trick to beat a calculator and it's pretty impressive. Yoda Makes Mark Hamill Cry Mark Hamill gets emotional when he sees Yoda on the set of Star Wars The Last Jedi.