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The above procedure will extract both DNA and proteins, so the gunk you see may not be all DNA, to get more pure DNA you need to break down the proteins. To do this you need an enzyme called a protease. fresh pineapple and kiwi juices have these, which is why they hurt to eat - they are digesting your mouth. So you could add these and keep the mixture warm for 10mins or you could just extract teh DNA from kiwi fruit.Here is something I wrote a while back about this which you may find interestinghttp://www.chaosscience.org.uk/pub/public_html//article.php?story=20050524184709373 [Links inactive - To make links active and clickable, login or click here to register]
thanks for that, Dave. Just out of curisity, will you be adding any more dates to the chaos tour/roadshow?
Hmm.. I'm not sure of that experiment. At the beginning, is the coin bigger (cannot go in the hole), equal to (still cannot go in the hole) or smaller than the hole (can go in the hole)?
Putting the bottle in a freezer, would make the hole that little bit smaller, and then putting a "wet" coin would.. Oh I'm stuck! Oh well, I bet either way the result is that the coin falls into the hole. But I'm not sure why..
in honour of Anastasia, George and Karen...............and seanwhat you need2 tin canssome stringa friendwhat you dopoke a hole in the bottom of both tin cans, thread your string through both holes and tie them off.you should now a tin can connected to each end of the string, with the string stretched tight have your friend hold the can to his/her ear, whilst you talk in to the other can.what happens?
Great Paul! Loving those experiments, although I haven't done it. I can just imagine the outcome. Awesome. I've tried the marble one when I was young.. Got me astounded! LOL 
Excellent, Dr Dick.what you needa marblea drinking glass with straight sideswhat you doPlace the marble on a smooth surface. Turn the glass upside down and place it on the table, with the marble inside. Now, the idea is to pick the marble up off the table without touching anything except the glass. Hold the glass and start sliding it across the table in a tight circle. That should cause the marble to spin around the wall of the glass. If you move the glass faster and faster, the marble will spin faster and faster. Once it is spinning very quickly, slowly lift the glass, being sure to keep it spinning. As long as you hold it very level, the marble should stay in the glass as you lift it. Why?
Thanks, Seany. It would be nice if more people could contribute, hopfully lots of the experiments here you will not find elsewhere on the net. Or not in one place atleast.
I'm afraid mine are going into:http://www.thenakedscientists.com/HTML/content/kitchenscience/I've written up a fair few of the older ones since the website changed over.