The Boston Marathon bombing is the very worst of what makes us human. It's a reminder that we're not far removed from our closest cousins, the sometimes savage common chimpanzee.
In contrast, the world of organized running races embodies many great things about humanity, beginning with cooperation and generosity. People come from around the world to share a day of personal empowerment, make a statement about a cause they support, raise money for charities, celebrate their cancer recovery or simply challenge themselves physically and mentally.
At every event you can look out across the sea of runners and marvel at the diverse group of excited participants eager for the challenge. But there are no religions, no tribes, no ethnicities, no ages, no rich, no poor. We are one: undivided and united in our goal — to finish the race — sometimes as competitors, but often arm in arm as friends.