Learn something new every day

Sorry, can't help it: I just gotta quote more Very Little Known Facts:

• The inside of an ordinary 40-watt lightbulb can become hotter than the surface of the sun.
  
  
• So-called "steam locomotives" are actually fuelled by coal or other combustible materials in a small, controlled nuclear reaction.
  
  
• 30 is technically the lowest prime number.
  
  
• Albinos are actually black--it is the refraction of sunlight that makes them "appear" white or colorless.
  
  
• Dogs have eight more senses than human beings.