That's why it's always worth having a few philosophers around the place. One minute it's all is truth beauty and is beauty truth, and does a falling tree in the forest make a sound if there's no one there to… — Terry Pratchett Copy Share Image
Considering that knowledge of the chemical as well as the optical principles of photography was fairly widespread following Schulze's experiment (in 1725)... the circumstance that photography was not invented earlier remains the greatest mystery in its history... It had apparently… — Helmut Gernsheim Copy Share Image
