Would you like to make Mr. Wizard’s “automatic fountain”? Put a teaspoonful of detergent !the kind that foams) in hot water in a tall jar. Put a lump of dry ice inside the jar. A cloud of foam rises to the top of the jar spills over and creates an amazing fountain that bubbles automatically for a long time.   You can obtain the dry ice from an ice cream man,...

  Try this experiment. Place a long, thin, wide stick flat on the table, with about 8 inches sticking out over the table edge. The kind of wood used in fruit crates is excellent for this experiment. Cover the part of the stick on the table with two sheets of large size newspaper. Smooth out the paper. Now hit the end of the stick hard with another stick, or a hammer....