National Inventors' Day is held in the US on 11 February, the anniversary of the birth of Thomas Edison, perhaps the most prolific inventor ever. Some other countries celebrate their own inventors' days in honour of famous national inventors. Argentina, for example, holds its inventors' day on 29 September to mark the birth of Laszlo Jozsef Biro, inventor of the ballpoint pen. And, as Bystander wrote (PJ, 1 November 2009, p515), Germany, Austria and Switzerland celebrate National Inventors' Day on 9 November, the birthday of the Austrian-born Hollywood actress Hedy Lamarr, co-inventor of the frequency-hopped spread spectrum in 1942.
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