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What costs nothing but is wo...

What costs nothing but is worth everything, weighs nothing, but can last a lifetime, that one person can't own, but two or more can share?

Correct answers: 42

The first user who solved this task is Djordje Timotijevic.

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Why do cats always get their way

Today is "Respect Your Cat Day", so respect your cat!

Why do cats always get their way?
Because they're purr-suasive negotiators!

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Aerosol spray patent

In 1939, the first U.S. patent for dispensing liquids under pressure from a disposable container was issued to Julius Seth Kahn of New York City (No. 2,170,531). The patent was titled "Apparatus For Mixing a Liquid With a Gas," but was the predecessor of the aerosol spray can. In this case, the patent more particularly specified a use for whipping cream "by discharging the cream and gas mixture through a constricted orifice." The cream could be contained in a common soda-pop glass bottle. Gas could be introduced at controlled pressure. An inexpensive valve discharged the whipped cream. Its use was extended to applications such as dispensing paints, pharmaceuticals and insecticides.

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