Monday, January 25, 2010

Fold a piece of paper in half seven times

Can you do it eight times? Try it and see. You can use A3 or A4 printer paper. You might like to work in teams. Good luck!

The TV show Mythbusters took on this challenge and did manage to fold a piece of paper 11 times, but it was in an airplane hanger, and it was a giant sized piece of paper that they had to use a steamroller on.

Dr Karl also talks about the task here.

Monday, January 18, 2010

Make a volcano

What do you need?

- bicarbonate of soda
- vinegar
- red food colouring

- cardboard to form into a cone
- glue and ashes or dirt, to make it look real
- a small bottle to place inside the cone


Make your volcano then place a spoonful of bicarbonate of soda, and a teaspoon of red food colouring in the bottle.

Pour some vinegar into the bottle and stand back!

- The cool red lava is the result of a chemical reaction between the baking soda and vinegar.

- In this reaction, carbon dioxide gas is produced, which is also present in real volcanos.

- As the carbon dioxide gas is produced, pressure builds up inside the plastic bottle, until the gas bubbles out of the 'volcano'.

Here is a world map of volcanos.

Here is a map of the world's most recent volcanos!