BrewStew said:Get yourseld 6 coins and lay them out as follows:
By only moving ONE coin, you have to make a column and row of 4 coins.
BrewStew said:Hydrogen... or Helium?
J_P said:Put the bottom most coin on top of the coin that forms the middle of the cross.
I have a barrel and I half fill it with something, the half full barrel now weighs half what it did it was empty.
What have I half filled the barrel with?
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