"...from so simple a beginning endless forms most beautiful have been, and are being, evolved."
You'd be hard pressed to find a biology teacher who doesn't recognize that quote! The insights of Charles Darwin, and the biological research they spawned, forever changed the field of biology. Today you cannot fully understand biology unless you understand evolution; in the words of Theodosius Dobzhansky, "Nothing in biology makes sense except in the light of evolution."
I could wax on for hours about evolutionary biology; I appreciate it so much more now than I did as a college student, simply because I now understand it far better. Interestingly, coming up against parents or students who don't want to learn about evolution has simply strengthened my passion for teaching it and my desire to come up with ever more innovative and engaging labs and activities.
So it is with great joy that I point out that this year is the 200th anniversary of the birth of Charles Darwin. In honor of this, the BBC has come out with a website
which includes interviews with scientists and historians, as well as links to the complete works of Darwin online and British museum exhibitions. What a terrific resource!