This science trick is so simple, but so much fun. It's also easy for students to replicate at home. Equipment: -Two empty 375ml cans -Approx 100ml of water Method: -Secretly pour about 100mls of water into one can. -Have a student try to balance the other empty can tilted on its bottom rim. It is impossible. -Then amaze them, by easily balancing your ‘magic’ can on its bottom rim (they don’t need to know it has water in it). Explanation: It works because the water adds weight to the bottom of the can, changing its centre of gravity and allowing it to balance in otherwise impossible ways.