don had a number of votes. but your commander, john young had a few more votes than you did. so if somebody wanted to do something, -- well, talk about that hierarchy. talk about what mattingly wanted to do on the way back. >> on the way back from the moon -- we called him ken then. tk now. he had been in the command module. he wanted to fill his helmet with water to see what a helmet full of water would behave like. [laughter] at zero g. well, i mean he said it's not going to get away, but we started discussing this. and i -- he wanted to do it. so it was one vote for. i was sort of iffy, so i abstained. and john cast his 40,000 votes and said we're not doing that. >> so the point is he's got 40,000. you and mattingly had one vote each. >> he had to make the decision, yes. >> on the moon, you're only on the sunny side. what is the temperature fluctuation between -- >> surprisingly, it was all thermal engineering. we never took a thermometer to the moon, not once. not once did we measure the actual temperature of the surface. it was all the computer, computer equations driven. they knew the radiation history of the sun anyway. when we landed probably the archl temperature of