Science trick for the half term

[Blandmum]

you will need a paper clip, a magnet , some sewing thread and a bit of sticky tape.

Tie the paper clip to one end of the thread. Stick the other end of the thread to a flat surface.

Hold the paper clip up in he air, so that the thread is fully extended.

With your other hand , hold the magment a fer millimeters abover the paper clip (don't let it touch). This takes a bit of practice!

The paper clip will 'levitate, when the downwards force of gravity is equaled but the upwards attractive force of the magnet!

Magic, flying paper clips LOL

You can now see which compounds will let the magnetism 'through'...paper and card will, but iron sheets will not...the iron will shield the magnetism.

Should buy you 30 minutes of quiet ladies!

my brian hurts

I do what wiv da wat? doh

how do you do volcanoes?

Poor Brian, give him some parcetamol and a hot drink.

Volcanos

Easy

Make your vbolcano with a holder at the top end. mix some bicarbonate of sodium with red food colour (if you wish) Add vinegar. Reaction takes place making an acetic salt of sodium, carbon dioxide (the fizz) and water

\link{http://my.execpc.com/~rhoadley/magclips.htm\ for a picture of the magnet thing}

Soak an egg in vinegar for a couple of days. Then wash under the tap.
The shell will have dissolved and it will be held togeher by the membrane. if you hold it up to the light you can see the yolk.