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Aluminum

What Element was Once More Expensive Than Gold?

Gold is a chemical element with the symbol Au and the atomic number 79, making it one of the naturally occurring elements with a higher atomic number. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal in its pure form. In chemistry, gold is a transition metal and a group 11 element. …

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Light bulbs in the New York City subway system screw in “backwards” (i.e. with left-handed threads) so people won’t steal them to use at home.

Edison screw Three-way E26d light socket E26 Edison screw to NEMA 1-15 adapter Specifications for all lamp mount types are defined in the following American National Standards Institute (ANSI) and International Electrotechnical Commission (IEC) publications: Lamp Caps—ANSI C81.61 and IEC 60061-1 Lamp Holders—NSI C81.62 and IEC 60061-2 Gauges (to ensure interchangeability)—ANSI C81.63 and IEC 60061-3 …

Light bulbs in the New York City subway system screw in “backwards” (i.e. with left-handed threads) so people won’t steal them to use at home. Read More »

A teenager, Peter Roberts invented a quick-release ratchet. He sold his patent to Sears for $10,000 who said that the invention was not worth very much and then went on to make $44 million selling the ratchet. He sued them for fraud and was awarded $1 million.

Socket set with ratchet A socket wrench is a type of wrench or spanner that has a socket attached at one end, usually used to turn a fastener. The most prevalent form is the ratcheting socket wrench, often informally called a ratchet. A ratcheting socket wrench is the device within a hand tool in which …

A teenager, Peter Roberts invented a quick-release ratchet. He sold his patent to Sears for $10,000 who said that the invention was not worth very much and then went on to make $44 million selling the ratchet. He sued them for fraud and was awarded $1 million. Read More »