Imagine every thousandth blood cell in your body has a tiny radio transmitter in it. Imagine that 10 times a second that transmitter sends each cell's location to a computer storing the data. Along with position, it also sends the concentration of a list of 10 chemicals encountered at receptors distributed at 10 sites over the surface of each cell. Now imagine following all those blood cells for an hour. That makes a billion blood cells being sampled 10 times a second for 3,600 seconds.
Leo Manzano became the first American since 1968 to win an Olympic medal in the men's 1500 meter run in the London Games this summer. But he got a lot of criticism for carrying both Mexican and American flags during his victory lap. For Hispanic Heritage Month, Manzano speaks with host Michel Martin.