GPS satellites gain about 38 microseconds a day: uncorrected that is 10 kilometres of drift

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The Andromeda paradox: two walkers passing each other disagree about whether a fleet has already launched Light cones: why saying now about Alpha Centauri is a convention and not a fact Michelson and Morley found nothing in 1887 and that null result became physics' most useful measurement The twin paradox: the traveller really is younger and acceleration is what breaks the symmetry LIGO measured a stretch of space 1/1000 the width of a proton The speed of light is not really about light: it is the exchange rate between space and time Gravity Probe B's gyroscopes and the dragging of spacetime by a rotating Earth Two observers disagree about distance and duration but always agree on the spacetime interval Why length contraction is a convention about simultaneity and not a physical squash Hafele and Keating flew caesium clocks around the world in 1971 and the two directions were wrong in opposite ways