People shake with their right hands because, in the olden days, adults had guns and knifes in their right pockets, so, their right hand can quickly pull the weapon out and shoot a bullet or stab them. The reason the law has changed because, we do not want more English people dying so we changed to right hand.
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There will be 45 handshakes (assuming that each person doesn't repeat who they shake hands with). Use the following formula for this one (n*(n-1))/2 where n is number of people...so if 10 people its (10 x 9) / 2 = 45 handshakes, if 7 people its (7 x 6) / 2 = 21 handshakes etc.
Ambedexterous means: a person who is able to use both hands equally, instead of right or left handed. You can train yourself to use both hands equally.
This is not proven. The answer is probably no.
to leave 2 feet free to use as hands.
the negative is that people had to use their hands to bury anything and the positive was that they got payed for it.