"I think he would get a kick out of it, " says his son, Mr. Mocarski.

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"They get a real kick out if it, sometimes at the end of the phone call I'll tell them how far I've walked, " she adds.

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"If a dark matter particle comes in and hits the argon, the recoiling atom gets a kick of energy and it quickly tries to get rid of it, " says Dr Ghag.

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When they get an opportunity it is ingrained in them to play by numbers, so you see them returning a bad kick with another bad kick, and it is very difficult to get out of.

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You may tire of having to kick this thing like it's a lazy court jester to get it to move.

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