Did man really walk on the moon?

[Glendon]

I have a Phi Beta Kappa graduate friend who swears up and down that man never went to the moon according to calculations that him and his collegues did at Purdue University as a part of some study. Something about a radiation barrier in front of the moon that would require three feet of lead to prevent instant death from passing through?

Since I have no background in physics or advanced mathmatics, I cannot argue with him. Although I technically believe we (U.S.) did visit the moon, I do not discount the possibility of government conspiracy centered around the Cold War during that time. Until I am educated enough on the mechanics/technology available at that era, I cannot really make an absolute decision either way.