another random user writes: Sunday the 7 October is the 60th anniversary of the barcode patent, filed in the US in 1952. However the distinctive black-and-white stripes did not make their first appearance in an American shop until 1974 — because the laser technology used to read them did not exist.
Thus mathematics may be defined as the subject in which we never know
what we are talking about, nor whether what we are saying is true.
-- Bertrand Russell