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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. 100% renewable energy - Wikipedia

    en.wikipedia.org/wiki/100%_renewable_energy

    100% renewable energy is an energy system where all energy use is sourced from renewable energy sources. The endeavor to use 100% renewable energy for electricity, heating/cooling and transport is motivated by global warming, pollution and other environmental issues, as well as economic and energy security concerns.

  4. Attention deficit hyperactivity disorder - Wikipedia

    en.wikipedia.org/wiki/Attention_deficit...

    Medical condition Attention deficit hyperactivity disorder People with ADHD struggle more than others to sustain their attention on some tasks (such as schoolwork), but may maintain an unusually intense level of attention for tasks they find immediately rewarding or interesting. Specialty Psychiatry pediatrics Symptoms Inattention carelessness hyperactivity executive dysfunction disinhibition ...

  5. Slope - Wikipedia

    en.wikipedia.org/wiki/Slope

    Definition Slope illustrated for y = (3/2)x − 1.Click on to enlarge Slope of a line in coordinates system, from f(x) = −12x + 2 to f(x) = 12x + 2. The slope of a line in the plane containing the x and y axes is generally represented by the letter m, and is defined as the change in the y coordinate divided by the corresponding change in the x coordinate, between two distinct points on the line.

  6. Zero-coupon bond - Wikipedia

    en.wikipedia.org/wiki/Zero-coupon_bond

    t. e. A zero-coupon bond (also discount bond or deep discount bond) is a bond in which the face value is repaid at the time of maturity. [1] Unlike regular bonds, it does not make periodic interest payments or have so-called coupons, hence the term zero-coupon bond. When the bond reaches maturity, its investor receives its par (or face) value.

  7. Off-price - Wikipedia

    en.wikipedia.org/wiki/Off-price

    Off-price. Off-price is a trading format based on discount pricing. Off-price retailers are independent of manufacturers and buy large volumes of branded goods directly from them. The off-price retail model relies on the purchase of over-produced, or excess, branded goods at a lower price, thus being able to sell to consumers at a discount ...

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