Why do Newton's laws work so well if they are not the final word?

Newton's laws work because everyday life happens where their errors sit near the fifteenth decimal place. Anything a person handles moves far slower than light, and its position is copied into the room by every photon and air molecule that leaves it, so often that the odds of it being anywhere else fall below one in 10⁷⁷. That copying makes a chair definite and its readings ordinary numbers. In 1960 Pound and Rebka measured how much slower a clock runs at the foot of a 22.5 meter tower, about 2.5 parts in a thousand million million. The best clock of the eighteenth century drifted by about one part in a million. Newton's absolute time was safe by a margin no mechanical clock could close. His mechanics is an accurate readout of a layer underneath, where the moving happens.