So, for anybody interested in learning how to make their own petri dishes so they can grow nasty little bugs at home...
Boil ¼ cup of water. Add one teaspoon of gelatin and one teaspoon of sugar. Stir for one minute until everything is dissolved.
2. Cool the solution for ten minutes.
3. Fill a petri dish to a little below the top edge.
4. Close the petri dish by putting on the cover immediately. Let the covered petri dish stand for at least four hours. Don’t touch the growth medium or you’ll add your own germs!
This recipe will fill two small petri dishes. If you and your class plan to fill more petri dishes, make more germ food by increasing the amount of your ingredients proportionally.
*Adapted from Gross But True Germs by Luann Colombo. See details in bibliography. If you don’t have the materials needed for the experiment, you can purchase Ms. Colombo’s book, which includes all the supplies needed to conduct the experiment.
Recopied from wikiHow
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