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Topic ideas!!! What factor has the greatest effect on the speed at which a seed will germinate? What will help cut flowers stay fresh looking longer? How can snow be melted on a driveway without shoveling? Do bright colors help us remember things better? Does fireplace ash make a good plant fertilizer? What substances make effective, non--toxic cleaning fluids? Is density related to wood strength? What type of material would provide the best insulation for the human body when wet? What type of soil is best for plants? Does the position of a plant affect root and plant growth? Does the pH of precipitation change when it rains for a long time? Does carbon dioxide in Earth's atmosphere affect air temperature? How reliable are eyewitness reports? Do mnemonics actually help people remember things? Do students remember a sequence of letters and numbers better if they hear or see the sequence first? Is there a difference in short-term memory between boys and girls? Does reaction time in teenagers depend on the loudness of a sound? How does talking on a cell phone or listening to music affect reaction time? Do you do better at a task if you see the instructions or if you hear the instructions? Do different colors of light affect plant growth? Does cell phone reception depend on the time of day or location? Can corn byproducts be used as an effective insulating material? Can recycled newspaper be used to fertilize plants? What is the lead content of drinking water at home and at school? How does the concentration of salt in water affect seed germination? Which materials work best as thermal insulators? How does temperature affect the output of a light stick? Does water droplet size affect the brilliance of a rainbow? Does temperature affect magnetism? Does baseball bat composition affect the distance that a ball can be hit? Which scoopable cat litter has the most liquid absorbency? Do water purifiers really work? How strong are nylon fishing lines? In which liquids do seeds grow best? Do bean plants grow best in soil or water? What is the best shape for a kite? Which brand of glue holds two boards together best? Which brand of battery makes toys run longest?
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