Inventor Quotes and aphorisms about difficult Nikola Tesla ,, There is no doubt that some plant food, such as oatmeal, is more economical than meat, and superior... Nikola Tesla Alexander Graham Bell ,, It is hardly an exaggeration to say that oral teachers and sign teachers found it difficult to sit ... Tim Berners-Lee Tim Berners-Lee Orville Wright Orville Wright William Kamkwamba Robert Jarvik Jacque Fresco