Science
  • What is the weight of a liter of water?
  • What is the electric voltage
  • How to make a volt
  • Why green water
  • The essence of the law of Malus
  • How did the human race
  • What is alternating current
  • Why thunder
  • Who are Siamese twins
  • What is different from stalagmite stalactite
  • How to mix the reagents
  • As in zero gravity to heat the water
  • How to determine the time
  • Why silver will darken
  • On what numbers is a solar Eclipse