Friday, July 23, 2010

Clean Hands

We were trying to find how much bacteria was on a washed and unwashed thumb. 

You first wash your thumb finger then get the agar plate and put the unwashed thumb on the agar plate and put your washed thumb on the other side of the agar plate. 

Mr Wood took the agar plate to a scientist and he put it in an incubator. It has green spots like grass circles on the agar plate and a little bit big and on the unwashed side because I did not wash it properly for 20 seconds and dry it for 20 seconds. 

You can wash you hands if you are having lunch or something to eat. You wash them for a minute with a lot of soap and after that dry it for 1 minute.

By Tyler
This is an example of our agar plates, we learnt that even though we think our hands are clean, sometimes they aren't.


  1. This is a great idea and the students would love seeing the growth, although I would have to stay it would be a good encouragement to wash my hands after seeing the difference between the two!
    Mr Webb and Room 8, Melville Intermediate, Hamilton, Waikato.

  2. eeewwww - that is one gross thought! all that stuff growing on my hands if I don't wash them! Guess what?! I am washing my hands whenever I should be! No complacency about that one thanks to your post here! Our principal suggests we sing Happy Birthday to Me as we wash and then again dry our hands. This gives an idea of how long that minute that you recommend is.

    Great post, Team! :-)

  3. Viola and BernadetteJuly 26, 2010 at 3:24 PM

    I think that it was fun finding out how many bacteria is on our hands.
    Well done Tyler you did a beautiful story:D


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