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Across 1. He invented dynamite 6. The earliest of these was the scrub board, invented in 1797. 11. In 1837, Charles Goodyear received his first patent (US patent #240) for a process that made this an easier product to work with. 12. Co-invented by Jack Kilby and Robert Noyce. 13. This is considered the second oldest toy in history, the oldest being the doll. In ancient Greece, the toy was made of wood, metal and terra cotta. The Greeks decorated the two halves with pictures of their gods. 14. 1886 - On January 29, he received the first patent (DRP No. 37435) for a gas-fueled car 16. Edward Lowe was an entrepreneur whose cat-box filler is best known by this name 18. Using this chamber, the patient breathes 100% oxygen at pressures greater than normal atmospheric (sea level) pressure 21. Larry Page and Sergey Brin 22. This machine is used for raising water and was invented by this ancient Greek scientist and mathematician 24. James Naismith invented and named the game in 1891 25. Eli Whitney's patent of 1794 for this machine that separates seeds, hulls and other unwanted materials 28. This was invented over four thousand years ago to keep people dry. 29. Eating this allowed this Earl to have one hand free for card playing. 30. An instrument which measures vertical distance with respect to a reference level 31. Records the distance that a vehicle travels 32. DuPont demonstrated this to the American public at the 1939 New York World's Fair. Stockings made from this were used as currency during the war. 33. English chemist and apothecary coated the end of a stick with certain chemicals and let them dry. You can start a fire with these sticks. 34. Cotton swabs under this popular brand name were invented in 1923

Down 2. First practical process of photography 3. A combination of the word velour and crochet, this was meant to rival the zipper in its ability to fasten. 4. The name for the layout of typewriter keys 5. In 1937, American law student Chester Carlson invented a copying process based on electrostatic energy. 7. Wilbur and Orville Wright patented the "flying machine" 8. He was a second year student when he wrote the software for the Facemash website 9. Reflecting studs set into the surface roads 10. He invented pasteurization 15. With over 400,000 made each year, this lamp is enjoying a comeback 17. Elisha Graves Otis did not actually invent this, but his brakes made skyscrapers a practical reality 19. Animal figurines designed with live herbs that simulate the fur or hair of a particular animal 20. Theodore (Teddy) Roosevelt, the 26th president of the United States, is the person responsible for giving this toy his name. 23. This loom automatically controlled the warp and weft threads by recording patterns of holes in a string of cards 26. Beginning in 1942, Zamboni had started working on a machine that would quickly renew the surface of an ice rink. 27. The Greeks used hooping as a form of exercise - but this product became a fad in the 1950s