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White House. Design date. 2003. The United States twenty-dollar bill (US$20) is a denomination of U.S. currency. A portrait of Andrew Jackson, the seventh U.S. president (1829–1837), has been featured on the obverse of the bill since 1928; the White House is featured on the reverse. As of December 2018, the average life of a $20 bill in ...
A person wearing a simple face mask. The simple face mask ( SFM) is a basic disposable mask, made of clear plastic, to provide oxygen therapy for patients who are experiencing conditions such as chest pain (possible heart attacks), dizziness, and minor hemorrhages. This mask is only meant for patients who are able to breathe on their own, but ...
Bian Lian ( traditional Chinese: 變臉; simplified Chinese: 变脸; pinyin: Biàn Liǎn; lit. 'Face-Changing') is an ancient Chinese dramatic art that is part of the more general Sichuan opera. Performers wear brightly colored costumes and move to quick, dramatic music. They also wear vividly colored masks, typically depicting well known ...
The United States was left for dead after a 3-0 thrashing by the hosts French to start the tournament. But the Americans responded with consecutive blowout wins, 4-1 over New Zealand and 3-0 over ...
In February, students at the Albert Einstein College of Medicine in New York received free tuition after a $1 billion dollar donation from a former faculty member, Dr. Ruth Gottesman. In 2018, NYU ...
1908. Design discontinued. 1933. The Saint-Gaudens double eagle is a twenty- dollar gold coin, or double eagle, produced by the United States Mint from 1907 to 1933. The coin is named after its designer, the sculptor Augustus Saint-Gaudens, who designed the obverse and reverse. It is considered by many to be the most beautiful of U.S. coins.
Simple quintuple meter can be written in 54 or 58 time, but may also be notated by using regularly alternating bars of triple and duple meters, for example 24 + 34. Compound quintuple meter, with each of its five beats divided into three parts, can similarly be notated using a time signature of 158, by writing triplets on each beat of a simple ...
Beat (acoustics) In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies. With tuning instruments that can produce sustained tones, beats can be readily recognized.