Gary Goofball has a rare 1813 gold $5 piece. He is standing by a well when Kathy Clutz bumps into him and the gold-piece
drops down the well. The well has a depth of 75 m. What was
the length of time for him to hear the slash made by the gold-
piece?

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

there are no atoms

answerdmitry mendeleyev made a workable classification of the elements