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Using my TAGSAM arm, I'll touch site Nightingale for several seconds. Once I sense contact with the surface, I'll fire a bottle of nitrogen gas to disturb the ground, and some of that material will be gathered in the sample collector head. Finally putting my arm to use 
pic.twitter.com/RIfjvCH1FG
My arm has a spring in its "elbow", so when I touchdown on the surface the spring will compress a little (kind of like a pogo stick). This compression is what signals the gas bottle to fire 
pic.twitter.com/PCAMyH3Ntl
