Sounds, whether from talking, music, an earthquake, a fire or a sonic boom, travel in waves. Wave travel, called propagation, has a different velocity through each material, like water or air.Frequenc ...
The interactions between current, the flow of electrons, and magnets can be used to do useful work, like power motors, and will continue to be important in the future because they can be used for thin ...
Bacteria are single-celled organisms. They are very tiny—tiny enough that you cannot see one with the naked eye (although you can see a whole bunch). Bacteria serve all sorts of functions in the envir ...
Windmills are machines that convert energy from the wind into useful work by rotating. The rotation of a windmill often powers a motor or generator used to produce electricity or mechanical work (movi ...
Steam, which is the gaseous version of water, can be used to power trains, lights in buildings, and your very own model boat! Learn how to make a steam powered rocket boat to see Sir Isaac Newton's th ...
Slime mold is made up of organisms that resemble amoebas (single-celled organisms with no definite shape) and can easily be described as “blobs.” They move around looking for food and avoiding predato ...
Salt, a mineral with the main component being sodium chloride, or NaCl, has been used for millennia to help preserve food (and make it tasty!). In ancient times, salt was used as a form of currency in ...
Water, the major building block of life, sometimes has additives for health reasons. Hard wateris water that has a high amount of dissolved minerals, generally calcium carbonate or magnesium salts.Thi ...
Lightning is the electronic discharge between particles in the air andclouds and the ground. Electricity is carried through current, or the flow of electrons, and lightning is caused by very large cur ...
There are 8 planets (and one dwarf planet) in orbit around the sun, hurtling around at tens of thousands or even hundreds of thousands of miles an hour. Because the planets are attracted to the sun an ...