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  2. Estrogen - Wikipedia

    en.wikipedia.org/wiki/Estrogen

    Estrogen (British English: oestrogen; see spelling differences) is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. [ 1 ][ 2 ] There are three major endogenous estrogens that have estrogenic hormonal activity: estrone (E1), estradiol (E2), and estriol ...

  3. Estonia - Wikipedia

    en.wikipedia.org/wiki/Estonia

    Estonia is a developed country with a high-income advanced economy, ranking 31st in the Human Development Index. [24] The sovereign state of Estonia is a democratic unitary parliamentary republic, administratively subdivided into 15 maakond (counties).

  4. James Buchanan - Wikipedia

    en.wikipedia.org/wiki/James_Buchanan

    Buchanan suffered from esotropia. In addition, one eye was short-sighted and the other far-sighted. To cover this, he bent his head forward and leaned it to one side during social interactions. [142] This led to ridicule, which Henry Clay, among others, used ruthlessly during a congressional debate. [143]

  5. List of presidents of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_Presidents_of_the...

    Since the office was established in 1789, 45 men have served in 46 presidencies. The first president, George Washington, won a unanimous vote of the Electoral College. [4] Grover Cleveland served two non-consecutive terms and is therefore counted as the 22nd and 24th president of the United States, giving rise to the discrepancy between the ...

  6. Apostrophe - Wikipedia

    en.wikipedia.org/wiki/Apostrophe

    The apostrophe (' or ’) is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet and some other alphabets. In English, the apostrophe is used for three basic purposes: The marking of the omission of one or more letters, e.g. the contraction of "do not" to "don't".

  7. Serbia - Wikipedia

    en.wikipedia.org/wiki/Serbia

    Serbia is an upper-middle income economy and provides universal health care and free primary and secondary education to its citizens. It is a unitary parliamentary constitutional republic, member of the UN, CoE, OSCE, PfP, BSEC, CEFTA, and is acceding to the WTO.

  8. English language - Wikipedia

    en.wikipedia.org/wiki/English_language

    English is a West Germanic language in the Indo-European language family originating on the island of Great Britain. [4][5][6] Speakers of the language are called Anglophones owing to the namesake of the language, the Angles, one of the Germanic tribes that migrated to Britain in the early medieval period.

  9. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    t. e. The number π (/ paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.