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2. Gray card - Wikipedia

   en.wikipedia.org/wiki/Gray_card

   A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.

3. HP coupon 20% off ink and toner - AOL

   www.aol.com/2010/10/08/hp-coupon-20-off-ink-and...

   If you save money buying off-brand ink cartridges and toner, this HP ink coupon for 20% off may convince you to pay more for HP ink. Expires Oct. 31, 2010. To get the coupon, either share a horror ...

4. Jellyfish - Wikipedia

   en.wikipedia.org/wiki/Jellyfish

   Jellyfish. Spotted jellies swimming in a Tokyo aquarium. Jellyfish, also known as sea jellies, are the medusa -phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are ...

5. Ten-code - Wikipedia

   en.wikipedia.org/wiki/Ten-code

   California Penal Code sections were in use by the Los Angeles Police Department as early as the 1940s, and these Hundred Code numbers are still used today instead of the corresponding ten-code. Generally these are given as two sets of numbers [ citation needed ] —"One Eighty-Seven" or "Fifty-One Fifty"—with a few exceptions such as "459 ...

6. 20 (number) - Wikipedia

   en.wikipedia.org/wiki/20_(number)

   Twenty is a pronic number, as it is the product of consecutive integers, namely 4 and 5. [3] It is the third composite number to be the product of a squared prime and a prime (and also the second member of the 22 × q family in this form). It has an aliquot sum of 22; a semiprime, within an aliquot sequence of four composite numbers (20, 22, 14 ...

7. Morse code - Wikipedia

   en.wikipedia.org/wiki/Morse_code

   Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy .