Some scientific discoveries come about after painstaking, goal-oriented lab work finally yields the result that a researcher is trying to find. But many of the most incredible discoveries in the world came about when someone found something they weren't looking for. In some cases, these are the result of a true accident. Lucky accidents have allowed people to discover unexpected but useful side effects from drugs, which is what happened with Viagra.

Chapter 1. The Microwave Oven

Chapter 2. The Post-It Note

Chapter 3. The First Artificial Sweetener

Chapter 4. Penicillin

Chapter 5. Chocolate Chip Cookies

Chapter 6. The X-ray Machine

Chapter 7. Super Glue

Chapter 8. Pacemaker

Chapter 9. Potato Chips

Chapter 10. Teflon

Chapter 11. Champagne

Chapter 12. Chewing Gum

Chapter 13. Popsicles

Chapter 14. Coca-Cola

Chapter 15. Dynamite

Chapter 16. Matches

Chapter 17. Viagra

Chapter 18. Safety Glass

Chapter 19. Brandy

Chapter 20. Quinine

Chapter 21. The Pap Smear

Chapter 22. Dry Cleaning

Chapter 23. Vulcanized Rubber

Chapter 24. Vaseline

Chapter 25. The Ice Cream Cone

Chapter 26. Botox Treatment

Chapter 27. Tea Bags

Chapter 28. The Safety Pin

Chapter 29. Silly Putty

Chapter 30. Bubble Wrap

Chapter 31. Insulin

Chapter 32. Corn Flakes

Chapter 33. Plastics

Chapter 34. E-Mail

Chapter 35. iTunes.

Chapter 36. Invented for Something Else

Chapter 37. Stolen ideas

Chapter 38. Unknown Geniuses

Chapter 39. Inventions That Are Killing the Planet

Chapter 40. The Worst For the World