Help! dd (10) needs urgent help with science project ideas

[nooka]

So dd and her friend were working on a project (using Barbies to test different hair products in a variety of conditions - snow, heat, rain etc) for her science fair. But today the friend announced she was going to go it alone .

The science fair is in two weeks and dd needs help with ideas.

If anyone has any ideas we'd be very very grateful!

It has to involve a control and at least one test subject, and it needs to 'help people' (but obviously not very much as I don't personally think that testing hair products, even on Barbies is a lifesaver!)

So far we've thought of experimenting with making Taffy (North American toffee - we're in Canada) but we need a few ideas for dd to take to her teacher and get the go ahead. Oh and it needs to be original, or at least not frequently done.

Oh and it needs to lend itself to a neat display (dd is very neat though, and she will work hard).

She seems to be quite interested in experiments involving bacteria for some reason, or the elements, or 'something a bit crazy'.

Or how long it takes to set in the freezer, fridge, at room temp, on a heater....

Just to let you know that the science fair was today. dd was happy with her taffy project and there was a huge range of really interesting experiments, including vegetable batteries, mold growing, dyeing (both vegetables and wool), a few on cat food/dog food, plant growth, and many more

I was very impressed, and dd was pleased to give all the judges taffy