How many things did thomas Edison study?

Does saltwater cause rusting? What is a good song to use for a project? What if your body temperature is 33 degrees or below? What were the disadvantages of the galleon? What two things can you use to determine the most appropriate genre for your writing? Why isnt cellular energy required for the passenger molecule to be carried across the cell membrane by the carrier molecule? How do you wash a shower curtain? A steel beam weighing 4000 N is lifted to 12 M how much work is done? Can coconut juice substitute for blood plasma? Is rainwater could cause fever? If a ship sails at 40 kilometers per hour (kmhr) how far will it sail in 8 hours? If my hypothesis is proven wrong by my data what would i do next? How many legs does a housefly have? How many sq. Feet in 244 sq. yards? What are the common characteristcs of a faucet? What is Na2 CO3 IOH2O? What color does yellow and orange give you? Is it true Numerical age dates based on radioactivity are very important for studying Precambrian geologic history because fossils are rare or absent? Where did science come from? Why does air pressure crush the can?