What do you know about Black Friday, digital watches and IQs?

Why is it called Black Friday?......

Black Friday was introduced in the US on the day after the Thanksgiving holiday and was so-named because brisk business helped retailers back into profit - into the black. UK retailers are expecting their biggest day of spending this year.

http://news.sky.com/story/1381823/black-friday-police-called-to-retail-frenzy

When was the first digital watch invented?

On April 4, 1972, the Pulsar was finally ready, made in 18-carat gold and sold for $2,100. It had a red light-emitting diode (LED) display. Digital LED watches were very expensive and out of reach to the common consumer until 1975, when Texas Instruments started to mass-produce LED watches inside a plastic case.

http://en.wikipedia.org/wiki/Watch

Who first introduced the concept of IQ?

History of IQ Testing. The abbreviation IQ comes from the term intelligence quotient first coined by psychologist William Stern in the early 1900's. This term was later used by Alfred Binet and the French government to objectively test and identify children in public schools with special educational needs.

https://www.boundless.com/psychology/textbooks/boundless-psychology-textbook/intelligence-11/measuring-intelligence-62/iq-tests-242-12777/