- Most difficult on top
Day away - science puzzle
Sarah and Mike conclude that it is wednesday. But five minutes later it is already friday. How is that possible?
Boat and stone - science puzzle
Suppose you sit in a rubber boat in a swimming pool. In the boat lies a stone. You throw this stone from the boat into the pool. Will the water level in the pool raise or drop?
Eiffel tower - science puzzle
| The Eiffel tower in Paris has including the tv antenna an height of 321 meter. It is made out of 7 million kg steel. Somebody would like to build a scale model of this tower with a weight of 1 kg. How tall will this scale model be? |
|
- Most difficult on top