In science, a hypothesis is an idea about how or why something works that must be carefully tested in order to verify whether it is true or false. To test a hypothesis, a scientist must follow scientific method so that the hypothesis can be verified or refuted by other scientists.
To make a potato clock, connect two potatoes to a low-voltage LED digital clock with copper wire, galvanized nails and alligator clips. This easy chemistry project demonstrates the concept of electrochemical cells, in which chemical energy is converted to electrical energy.
A potato can be grown for a science experiment by putting the end of a sprouted potato into a glass of water and waiting for it to grow. It takes a few weeks for a potato to completely sprout in this way.
Some interesting science projects include creating an electromagnet out of a battery, copper wire and an iron nail; making a lava lamp out of a soda bottle, vegetable oil and a fizzing tablet; and making an egg float in water with salt.
Some ideas for good science projects include examining whether black light detects invisible stains and why insects are attracted to lamps. Another potential project explores what kind of automotive antifreeze is safest for the environment and why.
Cool science project ideas include the pinto bean germination experiment, the corrosiveness of soda experiment, and the tongue sensitivity experiment. This projects are ideal for students in elementary and middle school.
High school science project ideas include the effects of acidity on invertebrates and natural materials that make pigments, notes Mary Bagley for Live Science. Other ideas are the effects of breakfast on school performance and the effects of different fertilizers on plant growth, states Dr. Anne Mar
Some science projects for kids are making a vinegar volcano, tornado in a bottle, creating an easy lava lamp and making a rainbow. These projects are hands-on, safe and simple.
Some examples of working models for science projects include a pinhole camera, a hovercraft and a baking soda volcano. The hovercraft and volcano projects are simple enough for upper elementary and middle-school students. The camera is best for high-school students.
Sites with ideas for science projects include Science Buddies, Education.com and All Science Fair Projects. These sites offer a variety of project ideas for students of all ages.