Welcome to the twenty-eighth episode of TopX, the http://www.WatchMojo.com show where we countdown the very best that YouTube has to offer! Today we're drawing conclusions about the top 10 animated channels on YouTube.

There are a number of extremely hazardous materials in the world, and you should definitely try to avoid all of them. The most dangerous substances on Earth include chemical elements as common as Mercury and Lead, or famously toxic materials like ricin and sarin. WatchMojo takes a look at ten dangerous substances that will straight-up kill you, so you can stay safe.