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2. Buy one, get one free - Wikipedia

   en.wikipedia.org/wiki/Buy_one,_get_one_free

   The economist Alex Tabarrok has argued, that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion, they may only buy one item at half price, because the value they attach to the second unit is lower than even the discounted price.

3. 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., ... For example, when n = 50 it takes about 225 [b] trials on average to collect all 50 coupons.

4. Mail - Wikipedia

   en.wikipedia.org/wiki/Mail

   The word mail comes from the Middle English word male, referring to a travelling bag or pack. [2] It was spelled in that manner until the 17th century and is distinct from the word male . The French have a similar word, malle , for a trunk or large box, and mála is the Irish term for a bag.

5. Plastic recycling - Wikipedia

   en.wikipedia.org/wiki/Plastic_recycling

   Plastic recycling is the processing of plastic waste into other products. [1] [2] [3] Recycling can reduce dependence on landfill, conserve resources and protect the environment from plastic pollution and greenhouse gas emissions.

6. Concrete - Wikipedia

   en.wikipedia.org/wiki/Concrete

   Global warming potential (GWP) of GGBS decreased by 1.1 kg CO 2 eq/m 3, while FA decreased by 17.3 kg CO 2 eq/m 3 when the mineral admixture replacement ratio was increased by 10%. This study also compared the compressive strength properties of binary blended low-carbon concrete according to the replacement ratios, and the applicable range of ...