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2. Gold code - Wikipedia

   en.wikipedia.org/wiki/Gold_code

   A Gold code, also known as Gold sequence, is a type of binary sequence, used in telecommunications [1] and satellite navigation . [2] Gold codes are named after Robert Gold. [ 3 ] [ 4 ] Gold codes have bounded small cross-correlations within a set, which is useful when multiple devices are broadcasting in the same frequency range.

3. Herbert R. Kohl - Wikipedia

   en.wikipedia.org/wiki/Herbert_R._Kohl

   Herbert Ralph Kohl (born August 22, 1937) [1] is an American educator best known for his advocacy of progressive alternative education [2] and as the author of more than thirty books on education. [3]

4. Free shipping - Wikipedia

   en.wikipedia.org/wiki/Free_shipping

   Based on ComScore data 65% of eCommerce transactions in Q4 2017 in the United States were with free shipping. This figure has been consistent for the last few years (ranging between 58% and 69%). Moreover, US respondents asked in the survey listed free shipping (54% mentions) as a most important factor for online shipping.

5. Gun-Free School Zones Act of 1990 - Wikipedia

   en.wikipedia.org/wiki/Gun-Free_School_Zones_Act...

   The Gun-Free School Zones Act of 1990 was originally passed as section 1702 of the Crime Control Act of 1990. It added 18 U.S.C. § 922(q) ; 18 U.S.C. § 922 itself was added by the Omnibus Crime Control and Safe Streets Act of 1968 .

6. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/Coupon_collector's_problem

   Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

7. Free (band) - Wikipedia

   en.wikipedia.org/wiki/Free_(band)

   Free was the only advertised band who would not perform for free (despite their name) for the ailing Phun City festival in July 1970. Promoter Mick Farren said that when they learned there would be no payment, they left "without even getting out of the car."