OTD…April 6 and STS-41C

#OTD in 2012…California welcomes Endeavour back to birth state for retirement

#OTD in 1982…Columbia launches on the fourth space shuttle mission. #OTD in 1995…Atlantis launches on first shuttle-Mir docking flight

#OTD in 2012…Crowds cheer as Endeavour traverses though Los Angeles