Simple science experiments about measurement of time using everyday items with many experiments that can be turned into science fair projects.

Originally published as It's about time science projects : how long does it take? in 2003.

Safety first -- Time before clocks -- Measuring time with the sun -- A water clock -- A problem with water clocks -- A sand clock -- A candle clock -- Heart time -- From heart clock to pendulum clock -- A pendulum clock -- Running time -- Time to breathe -- Quick as a wink or a squeeze -- Time to fall -- How fast can you react? -- Decay time -- Estimating time -- Using time to stop motion -- A year of change.