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2. Dark matter - Wikipedia

   en.wikipedia.org/wiki/Dark_matter

   History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...

3. Attention deficit hyperactivity disorder - Wikipedia

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

   This article may require copy editing for grammar, style, cohesion, tone, or spelling. You can assist by editing it. (June 2024) (Learn how and when to remove this message) 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 ...

4. Alaska - Wikipedia

   en.wikipedia.org/wiki/Alaska

   Alaska (/ ə ˈ l æ s k ə / ⓘ ə-LASS-kə) is a non-contiguous U.S. state on the northwest extremity of North America.It is in the Western United States region. The only other non-contiguous U.S. state is Hawaii.

5. Mortgage rates for June 25, 2024 - AOL

   www.aol.com/finance/daily-mortgage-rates-for...

   Daily mortgage rates for June 25, 2024: Rates for 30-year terms relatively flat, while 15-year terms tick up Kelly Suzan Waggoner Updated June 25, 2024 at 6:00 AM

6. Percentage - Wikipedia

   en.wikipedia.org/wiki/Percentage

   Percentage. In mathematics, a percentage (from Latin per centum 'by a hundred') is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign (%), [1] although the abbreviations pct., pct, and sometimes pc are also used. [2] A percentage is a dimensionless number (pure number), primarily used for expressing ...

7. 1% rule - Wikipedia

   en.wikipedia.org/wiki/1%_rule

   1% rule. In Internet culture, the 1% rule is a general rule of thumb pertaining to participation in an Internet community, stating that only 1% of the users of a website actively create new content, while the other 99% of the participants only lurk. Variants include the 1–9–90 rule (sometimes 90–9–1 principle or the 89:10:1 ratio ), [1 ...