Sciences > Chemistry How to make invisible ink

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Invisible ink is a form of stenography, which is simply the art of writing hidden messages without letting the recipient know that there is, in fact, a message being sent. There is another form that is close to this: cryptography is a message that the recipient must riddle out. However, it is not hidden like stenography. Cryp... More..

Sciences > Chemistry The uses of helium

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In the United States, helium can be used for many different things. It can be used for advertising purposes, recreation, purge systems, and low-temperature cooling systems.Objects that float in the air, such as balloons, blimps, and other things of that nature, are filled with helium. Why? Because hydrogen is usually more dan... More..

Sciences > Chemistry How mood rings work

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Mood rings are rings that show different colors and those colors correspond to the certain emotion you are feeling, or so people say. In the 1970s, they were all the rage. They were invented by Joshua Reynolds and these rings were a big fad during that time fitting the whole '70s feel of that decade.The mood ring doesn't real... More..

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