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This Touchless Gear System Uses Fluid Dynamics to Transfer Power and Rotation Without Any Teeth

Engineers reinvent the 5,000-year-old gear using fluids instead of solid teeth.
Nature

From eye movements to actions: how batsmen hit the ball

Looking in the right place at the right time is particularly important in ball sports such as tennis, cricket or baseball, in which a player needs to determine the future trajectory of the ball and ...