1. What is the chemistry behind the method of cleaning silver where you place it on some aluminum fo...(more)
  2. Can someone tell me how scientists are able to get an idea of how many foxes are in an area simpl...(more)
  3. When you squeeze out a piece of orange-peel on a flame, it catches fire violently. Why? What is t...(more)
  4. I am wondering about the difference between wood bats and aluminum alloy bats; I need a simple wa...(more)
  5. May I know what chemicals can undergo esterization by absorbing sunlight energy at 33 degree celc...(more)
  6. 1. I would like to know when was Hubble's constant discovered / invented? 2. How many times it ...(more)
  7. Is the interstellar space between the galaxies completely empty? Not even a single star or a nebu...(more)
  8. Is there any reaction which can take place without the exchange of heat with the surroundings or...(more)
  9. Gravity can produce motion in a body. Thus, it does work. But, for doing work, energy is needed....(more)
  10. Ok ... this has been bugging my mind. Is it possible to generate heat with your mind to set thing...(more)
  11. Are there some materials that shrink faster that other materials in cold? If yes, which ones? (more)
  12. When a nuclear particle radiates either an Alpha, Beta or Gamma praticle can that process be reve...(more)
  13. What is in most nail polish removers? (more)
  14. Why do (nearly) all birds move in a jerking motion as compared with other animals that move smoot...(more)
  15. If we put a current-carrying conductor inside a magnetic field (i.e. between two permanent magnet...(more)
  16. I am allergic to nickel and cobalt. (thanks to patch testing). I think it was provoked by taking...(more)
  17. Is there any other part of your body that acts like the funny bone...dense nerve endings, pain et...(more)
  18. I have heard somewhere that there is what could be described as a secondary brain in the large in...(more)
  19. How far is the Sun from Pluto? How long does it take for sunlight to travel to Pluto? (more)
  20. What is tocopheryl acetate? It's also called Vitamin E acetate. Is it like the chemical acetone...(more)