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Dextroamphetamine is a stimulant drug that treats ADHD and narcolepsy, and has various medical and recreational uses. It works by affecting the monoamine neurotransmitters in the brain, and can have side effects, dependence, and legal status.
A comprehensive list of the two-letter codes used by civil aircraft around the world, organized by country or region. Learn the meaning and history of each prefix, and how to identify the origin of an aircraft by its registration number.
Adderall is a combination of amphetamine salts used to treat ADHD and narcolepsy. It can cause side effects such as insomnia, loss of appetite, and addiction, and has different effects depending on the dose and enantiomer.
This web page provides a comprehensive list of TCP and UDP port numbers used by various network applications and protocols. It also explains the meaning of well-known, registered, and dynamic ports, and the legend of the table cells.
Learn about the equalities that involve trigonometric functions and are true for every value of the variables. Find the Pythagorean, reciprocal, reflection, shift, periodicity, angle sum and difference, and Ptolemy identities with examples and proofs.
A comprehensive overview of the Unicode characters, covering 161 modern and historical scripts, as well as multiple symbol sets. Learn how to reference Unicode characters using numeric or entity codes, and see the control codes and special characters.
ASCII is a character encoding standard for electronic communication that represents text in computers, telecommunications equipment, and other devices. It has 128 code points, of which only 95 are printable characters, and it was developed in part from telegraph code and influenced by Unicode.
Learn about the ISO 3166-1 standard that defines codes for the names of countries, dependent territories, and special areas of geographical interest. Find out the criteria, information, and disputes for the three sets of country codes: alpha-2, alpha-3, and numeric.