Hal Walker Jr., a pioneering African-American engineer, invented the laser technology Apollo 11 took to the Moon to measure the distance to Earth. The 79-year-old runs an after-school program to get ... more 
Hal Walker Jr., a pioneering African-American engineer, invented the laser technology Apollo 11 took to the Moon to measure the distance to Earth. The 79-year-old runs an after-school program to get minority students excited about science. (Oct. 12) less 
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Fri, Oct 12, 2012 2:15 PM EDT