SciShow
Why Does Rain Smell so Good... to Bugs?
Humans love the smell after good rain, though we may not be the the target of the pleasing aroma. There's evidence the characteristic post-rain scent is used to lure arthropods to bacteria.
Howard Hughes Medical Institute
Hhmi: Bio Interactive: Making of the Fittest: Co Evolution of Genes & Culture
Follow human geneticist Spencer Wells, Director of the Genographic Project of the National Geographic Society, as he tracks down the genetic changes associated with the ability to digest lactose as adults, tracing the origin of the trait...