SciShow
An Unexpected Tool to Track Ancient Civilizations...Bacteria
Scientists have used a bacteria that commonly infects us to track how ancient humans spread to the Americas from Siberia. And other scientists have discovered a new species of hyrax in the forests of Africa by listening to their barks...
SciShow
The Man Who Tried to Give Himself An Ulcer... For Science
In 1984, Dr. Barry Marshall had a theory about ulcers that he couldn't convince the science community of. So, he took matters into his own hands... or stomach, and infected himself with a potentially deadly bacterium.