Cut your cheese block into four equal-weight squares using a knife. Weigh each square to check they weigh the same, and trim away any excess cheese so all four squares are equal.
Place each block in a separate identical zip-lock freezer bags and compress the air from each bag before sealing it.
Label one bag "freezer," one "fridge," one "room" and the other "warm." Place each bag in the condition that is listed on it and leave identical thermometers on top of each one.
Check back twice each day to take a temperature reading from each block of cheese and observe the growth rate of mold on the blocks of cheese. Take photographs of the cheese, which you can display during a presentation or on a science fair stall.
Conclude your experiment after no less than eight days. Compare the different temperatures that the cheeses were exposed to and draw conclusions about how temperatures, whether low or high, affect the growth of mold.
Select four different types of hard candies, such as M&Ms, Mentos, Tic Tacs and Wrigley chewing gum. Purchase one packet of each of these types of candies.
Unpack the individual candies from your packs of candy and weigh them before making up 2 1/2 oz of each type of candy and placing them in separate test tubes.
Pour the liter of diet cola equally into four separate glass beakers before testing them one-by-one in a deep sink or in a clear space outside that you can easily clean of soda.
Test each of your candy-types individually by dropping the 2 1/2 oz of candy into a beaker of diet cola and standing well away from the reaction.
Observe the reaction that occurs to see which is most violent, before determining which of your chosen candies is least and most effective for creating a diet soda eruption.
Place the sewing needle flat on a table and rub up and down its length with a magnet for at least 20 seconds.
Poke a tiny hole at the top of the one-by-one-inch square of card using the needle and string the thread through it. Tie the other end of the thread around the middle of a pencil.
Poke the thread through the center of it the square of card--work the needle around so that it lays horizontally through the card and is balanced and centered through the card.
Lay the pencil flat across the top of the glass jar, so the thread with the square of card and the needle is dangling inside the glass jar; this completes your compass in a jar, which should point either north or south depending on which is closer.
Situate the jar, complete with pencil, on a flat surface, such as a table, and place the magnet next to the jar. Wait for the compass to settle out and indicate the direction of north or south. Experiment with slowly revolving your glass jar and seeing how the needle and card react. If your experiment is established correctly, the needle will point either north or south. Recalibrate the needle through the card to ensure it is centered if your compass in a jar is not working correctly. Test your compass again and see if it now points north or south.