HOUSTON - AUGUST 28: Visitors look at 3.2 million year old fossilized remains of "Lucy", the most complete example of the hominid Australopithecus afarensis, at the Houston Museum of Natural Science, August 28, 2007 in Houston, Texas. The exhibition is the first for the fossil outside of Ethiopia and has generated criticism among the museum community and others that believe the fossil is too fragile to be moved from it's home country. (Photo by Dave Einsel/Getty Images)
