The magic triangle

A triangle can be made by arranging 4 shapes on a 5 x 13 grid.
By re-arranging the shapes a new triangle can be made.
The  pieces in the lower triangle are exactly the same as those in the upper triangle, but now seem to take up less space so there is one blank square


Where does the white square come from?

Hover your mouse here for the solution

Here is another similar puzzle:

4 similar quadrilateral shapes are arranged into a square.
If each is rotated by 180º they make a similar square but there is a piece missing in the middle.
Where does the extra space come from?

Hover your mouse here for the solution

Bear Puzzle

A bear walks 1 kilometre south, 1 kilometre west and then 1 kilometre north
He ends up in exactly the same place he started.
What colour is the bear.

Hover your mouse here for the solution

4 litres of water problem

You are camping be the edge of a stream and a recipe calls for EXACTLY 4 litres of water.
bottlesUnfortunately you only have two empty containers, one that holds 3 litres of water and one that holds 5 litres.

How can you get exactly 4 litres (you can fill and empty the containers as many times as you like using water from the stream).

Hover your mouse here for the solution

Links to science games and puzzles

Science crossword puzzles


Do you know any other puzzles?
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