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2. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/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 given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...

3. Gamma-ray burst - Wikipedia

   en.wikipedia.org/wiki/Gamma-ray_burst

   These account for about 30% of gamma-ray bursts, but until 2005, no afterglow had been successfully detected from any short event and little was known about their origins. Since then, several dozen short gamma-ray burst afterglows have been detected and localized, several of which are associated with regions of little or no star formation, such ...

4. Phase-out of incandescent light bulbs - Wikipedia

   en.wikipedia.org/wiki/Phase-out_of_incandescent...

   According to this source, 1 November 2011 to 30 September 2012 will be a transitional period and as of 1 October 2012, imports and sales of ordinary incandescent bulbs of 100 watts or more will be prohibited. The first phase will be followed by a ban on 60-watt-and-higher incandescent light bulbs starting in October 2014.

5. Amazon plans to launch discount store in bid to fend off Temu ...

   www.aol.com/news/amazon-plans-launch-discount...

   Amazon said in 2023 the number of items sold by Chinese sellers on its site grew more than 20% year over year, while the number of Chinese merchants with sales upward of $10 million increased 30% ...

6. Dark energy - Wikipedia

   en.wikipedia.org/wiki/Dark_energy

   In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales. Its primary effect is to drive the accelerating expansion of the universe. Assuming that the lambda-CDM model of cosmology is correct, [1] dark energy is the dominant component of the universe, contributing 68% of the ...

7. Dark-sky movement - Wikipedia

   en.wikipedia.org/wiki/Dark-sky_movement

   The dark-sky movement is a campaign to reduce light pollution. The advantages of reducing light pollution include an increased number of stars visible at night, reducing the effects of electric lighting on the environment, improving the well-being, [1] health [2] and safety [3] of people and wildlife, [4] and cutting down on energy usage.