heurism or green fairy/blue tooth

9 November marks Inventors' Day (Tag der Erfinder) in the German Sprachraum. Perhaps coincidentally--perhaps not, the local's Swiss edition featured an article earlier in the week of Swiss inventions, which in addition to milk chocolate, the Helvetica font, and the Swiss army knife, include Velcro, LSD and absinthe. The occasion, purposed to encourage people to pursue their own ideas and remind people about the forgotten and unsung innovators, is observed on 9 November because of the birthday of Austrian actress and Erfinderin Hedy Lamarr, in recognition of her 1942 discovery of frequency hopping spread spectrum technique that eventually enabled the development of cellular telephony and Bluetooth technologies.