With so little genetic inventory to draw from, I don't see how a small number of organisms can compete with a whole non-mirror tree.

You like him because he's so nonchalant about the game, don't you?

What makes the wings?

Dr. Crothers delivered the gripping story of polio vaccine research demanded by the people for the kids (creating March of Dimes) and that ended the disease in the 50s. Now we need a new vaccine to eliminate all trace of virus, which still lurks in search of the unvaccinated.