The American Museum of Natural History says,
Happy 209th birthday, Charles Darwin! Two centuries after his birth, nearly everyone knows his name. Keenly observing nature in all its forms—from fossil sloths to mockingbirds, primroses to children—Darwin saw that we all are related. Every living thing shares an ancestry, he concluded, and the vast diversity of life on Earth results from processes at work over millions of years and still at work today. Darwin’s explanation for this great unfolding of life through time–the theory of evolution by natural selection–transformed our understanding of the living world.
And HHMI BioInteractive has some short films and other resources to help you (and your students if you’re a teacher) understand The Origin of Species.