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Physics
Gravity
Pendulum
Parents
Gravity
Instruments < Astrolabe
Children
1867 Paris Expo Universelle
Airy
Foucault, JBL
Fromanteel, A
Galileo
Huyghens, Christiaan
Longitude
Mersenne
Milne J
Roberval
Jumps
Big Ben
Clock / watch
Goddard, Robert