Don't flush sodium down the toilet. I've actually been told that before. Chemistry teachers routinely say it, which only makes students want to do it. Instead, watch two mad scientists with YouTube channels do it for us....

Mercury is a dense metal, but it’s also liquid, which makes it a rather odd substance to play experiment with. The same volume of mercury is 13 times heavier than water. Mad scientist CodyDon Reeder wondered if you...