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2. Adderall - Wikipedia

   en.wikipedia.org/wiki/Adderall

   Adderall is commonly used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy (a sleep disorder). Long-term amphetamine exposure at sufficiently high doses in some animal species is known to produce abnormal dopamine system development or nerve damage, but, in humans with ADHD, long-term use of pharmaceutical amphetamines at therapeutic doses appears to improve brain ...

3. Standard deviation - Wikipedia

   en.wikipedia.org/wiki/Standard_deviation

   The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.

4. Sun - Wikipedia

   en.wikipedia.org/wiki/Sun

   Why is the Sun's corona so much hotter than the Sun's surface? (more unsolved problems in astronomy) The temperature of the photosphere is approximately 6,000 K, whereas the temperature of the corona reaches 1,000,000–2,000,000 K. The high temperature of the corona shows that it is heated by something other than direct heat conduction from the photosphere. It is thought that the energy ...

5. Hydrogen peroxide - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_peroxide

   Hydrogen peroxide is a chemical compound with the formula H 2 O 2.In its pure form, it is a very pale blue liquid that is slightly more viscous than water.It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution (3%–6% by weight) in water for consumer use and in higher concentrations for industrial use.

6. Egypt - Wikipedia

   en.wikipedia.org/wiki/Egypt

   Egypt is considered to be a regional power in North Africa, the Middle East and the Muslim world, and a middle power worldwide. [24] It is a developing country having a diversified economy, which is the largest in Africa, the 38th-largest economy by nominal GDP and 127th by nominal GDP per capita. [25]

7. MailOnline - Wikipedia

   en.wikipedia.org/wiki/MailOnline

   MailOnline (also known as dailymail.co.uk and dailymail.com outside the UK) is the website of the Daily Mail, a tabloid newspaper in the United Kingdom, and of its sister paper The Mail on Sunday. MailOnline is a division of dmg media, which is owned by Daily Mail and General Trust plc . Launched in 2003 by the Associated Newspapers’ digital ...