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  2. Thermal expansion - Wikipedia

    en.wikipedia.org/wiki/Thermal_expansion

    Thermal expansion is the tendency of matter to change its shape, area, volume, and density in response to a change in temperature, usually not including phase transitions. [1] Temperature is a monotonic function of the average molecular kinetic energy of a substance.

  3. Smallpox - Wikipedia

    en.wikipedia.org/wiki/Smallpox

    Smallpox was an infectious disease caused by variola virus (often called smallpox virus), which belongs to the genus Orthopoxvirus. The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, making smallpox the only human disease to have been eradicated to date.

  4. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: If each box of a brand of cereals contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be ...

  5. Smoking in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Smoking_in_the_United_Kingdom

    Until 30 September 2007, the minimum age to purchase and consume tobacco products in public was 16 years of age. From 30 September 2007, the Tobacco and Primary Medical Services (Scotland) Act 2010 became effective, raising the minimum purchase, consumption, and possession age to 18 years of age. Section 4: Sale of tobacco products to persons ...

  6. REI’s Anniversary Sale is on! Score up to 60% off North Face ...

    www.aol.com/lifestyle/rei-sale-anniversary...

    But even if you're not a member, the outdoor gear company has slashed the prices on tons of gear — you can get up to 30% off! We've rounded up our faves from REI's that are discounted for ...

  7. Buy one, get one free - Wikipedia

    en.wikipedia.org/wiki/Buy_one,_get_one_free

    Buy one, get one free. " Buy one, get one free " or " two for the price of one " is a common form of sales promotion. 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 ...