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2. 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 given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...

3. 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.

4. Grayscale - Wikipedia

   en.wikipedia.org/wiki/Grayscale

   v. t. e. In digital photography, computer-generated imagery, and colorimetry, a greyscale (more common in Commonwealth English) or grayscale (more common in American English) image is one in which the value of each pixel is a single sample representing only an amount of light; that is, it carries only intensity information. Grayscale images, a ...

5. Cathode-ray tube - Wikipedia

   en.wikipedia.org/wiki/Cathode-ray_tube

   The only visible differences are the single electron gun, the uniform white phosphor coating, and the lack of a shadow mask. A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. [ 2 ]

6. Where to shop the best sales today: Big savings on Apple ...

   www.aol.com/lifestyle/where-to-shop-the-best...

   Rothy's: Take up to 30% off select styles during the end-of-season sale event. Target : Get up to 30% off laptops, 20% off Threshold bedding and rugs, and more. Therabody : Save up to $400 on ...

7. Contrast (vision) - Wikipedia

   en.wikipedia.org/wiki/Contrast_(vision)

   Contrast (vision) Contrast is the difference in luminance or color that makes an object (or its representation in an image or display) visible against a background of different luminance or color. The human visual system is more sensitive to contrast than to absolute luminance; thus, we can perceive the world similarly despite significant ...

8. Where to shop today's best sales: 25% off an iPad, 20% off ...

   www.aol.com/lifestyle/where-to-shop-todays-best...

   Le Creuset Signature Round Dutch Oven, 5.5 Quart. $336 $420 Save $84. Cook like Ina Garten this fall and winter with the queen's favorite 5.5-quart Dutch oven, now 20% off at Sur La Table. You can ...

9. Gamma ray - Wikipedia

   en.wikipedia.org/wiki/Gamma_ray

   γ. ), is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves, typically shorter than those of X-rays. With frequencies above 30 exahertz (3 × 1019 Hz) and wavelengths less than 10 picometers (1 × 10−11 m), gamma ray photons have ...