Jack Schmidt on the moon during Apollo 17. Source: http://www.hq.nasa.gov/alsj/a1 7/video17.html

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Gene comes bounding energetically down the mountain towards the rover. He loses his balance and falls to his knees, bounces forward on all fours, and his left foot kicks out an impressive spray of dust, perhaps 3 meters long, towards the rover camera. He rises and continues his traverse with undiminished attack.

Source: http://www.hq.nasa.gov/alsj/a1 7/video17.html

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Jack is having a few clumsy moments, knocking things over, falling down, and dropping things on the ground. As the clip begins, he has knocked over the Sample Collection Bag (SCB) and scattered full sample bags on the ground. He goes down on hands and knees and replaces the sample bags in the SCB. He stands up but drops the SCB in the process. He bends down to pick it up again but stumbles and falls forward onto the ground. After he stands, some sample bags fall from his camera bracket. It is such a comedy of errors that capcom Bob Parker says, "Hey, Gene, would you go over and help Twinkletoes, please?"

Source: http://www.hq.nasa.gov/alsj/a1 7/video17.html

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sulfur hexafluoride is more dense then the surrounding air

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Oh dear.
Another clip from It'll Be Alright On The Night.

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Images of the "Columbia Hills" region inside Mars' Gusev Crater, taken by the High Resolution Imaging Science Experiment camera on NASA's Mars Reconnaissance Orbiter, provided detailed, three-dimensional information that was used to create this animation of a hypothetical flyover. NASA's Mars Exploration Rover Spirit has been exploring this range of hills since 2004. No Audio

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