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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. 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 ...

  4. Ten percent of the brain myth - Wikipedia

    en.wikipedia.org/wiki/Ten_percent_of_the_brain_myth

    The 10% of the brain myth states that humans generally use only one-tenth (or some other small fraction) of their brains. It has been misattributed to many famous scientists and historical figures, notably Albert Einstein. [1] By extrapolation, it is suggested that a person may 'harness' or 'unlock' this unused potential and increase their ...

  5. Middle gray - Wikipedia

    en.wikipedia.org/wiki/Middle_gray

    Middle gray. 50% CIELAB lightness. ( Y = 18.4%) In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale; [1] in photography and printing, it is typically defined as 18% reflectance in visible light. [2] [3]

  6. List of countries by GDP (PPP) per capita - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_GDP...

    A country's gross domestic product (GDP) at purchasing power parity (PPP) per capita is the PPP value of all final goods and services produced within an economy in a given year, divided by the average (or mid-year) population for the same year. This is similar to nominal GDP per capita but adjusted for the cost of living in each country.

  7. Florida groups warn abortion rights amendment won't pass ...

    www.aol.com/news/florida-groups-warn-abortion...

    Among Republicans they spoke with, 28% say they support Amendment 4 while 25% are undecided — that's almost half of Republicans that could potentially support the measure, according to Berrios.

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