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Try this…
Bend your middle finger and place the centre section on a table or hard surface. You will be able to lift your thumb, index, and little finger without moving your middle finger. But it is impossible to lift your ring finger.
http://www.sciencemadesimple.co.uk/page73g.html
Bend your middle finger and place the centre section on a table or hard surface. You will be able to lift your thumb, index, and little finger without moving your middle finger. But it is impossible to lift your ring finger.
http://www.sciencemadesimple.co.uk/page73g.html