Blue light effect

Blue light makes people alert at night, which could be useful to people who work at night.

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Sharpen the pencil sharpener

You can actually sharpen the blades on a pencil sharpener by wrapping your pencils in aluminum foil before inserting them.

Colorful or I Love You

If you mouth the word "colorful" to someone, it looks like you are saying "I love you".

Weight of books

The Main Library at Indiana University sinks over an inch every year because when it was built, engineers failed to take into account the weight of all the books that would occupy the building.

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