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to lift 1 kg or 2 pounds you need 0.16 kg of helium so for 2000 pounds you need 160 kg of helium or 320 pounds at 1 atmosphere
In order to know how many people it would take, you would have to know what the activity it. While it may only take one person to murder someone else, it would take an army to fight a war.
It would take 80,000 years.
it would take about $170,243,286,935 to reach the moon proven by M.I.T
It would take about 21 foot rulers.