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2. Shockley–Queisser limit - Wikipedia

   en.wikipedia.org/wiki/Shockley–Queisser_limit

   This places an immediate limit on the amount of energy that can be extracted from the sun. Of the 1,000 W/m 2 in AM1.5 sunlight, about 19% of that has less than 1.1 eV of energy, and will not produce power in a silicon cell. Another important contributor to losses is that any energy above and beyond the bandgap energy is lost. While blue light ...

3. Dunbar's number - Wikipedia

   en.wikipedia.org/wiki/Dunbar's_number

   Dunbar's number. Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. [ 1][ 2] This number was first proposed in the 1990s by British anthropologist Robin ...

4. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Coupon. In marketing, a coupon is a ticket or document that can be redeemed for a financial discount or rebate when purchasing a product . Customarily, coupons are issued by manufacturers of consumer packaged goods [ 1] or by retailers, to be used in retail stores as a part of sales promotions. They are often widely distributed through mail ...

5. The best sales this weekend to know about: Vacuums, Coach ...

   www.aol.com/lifestyle/the-15-best-sales-this...

   Right now Coach Outlet is running an extra 15% off already-on-sale styles like this tote ... Choose from 5,000 BTUs up to 12,000 BTUs to find the right size for your room. ... Save $12 with coupon.

6. 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 ...

7. Speed of light - Wikipedia

   en.wikipedia.org/wiki/Speed_of_Light

   The γ factor approaches infinity as v approaches c, and it would take an infinite amount of energy to accelerate an object with mass to the speed of light. The speed of light is the upper limit for the speeds of objects with positive rest mass, and individual photons cannot travel faster than the speed of light. [39]