I live in Washington, D.C., and we have very long escalators coming out of the Metro. If I grabbed the handrail when I first step onto the escalator and did not let go until I was at the top, my body would be almost prostrate across the steps. As I go higher on the escalator, I have to readjust the hand that is grabbing the rubber handrail. Why can't the companies that make escalators sync the steps and the handrails so that they go the same speed?
Following the most stringent current standards for validation of ancient DNA sequences, we typed the mtDNA hypervariable region I of two anatomically modern Homo sapiens sapiens individuals of the Cro-Magnon type dated at about 23 and 25 thousand years ago. Here we show that the mtDNAs of these individuals fall well within the range of variation of today's humans, but differ sharply from the available sequences of the chronologically closer Neandertals.
What's the difference between Social Security and a Ponzi scheme?
Really, I want to know.
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