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Hydrogen peroxide ( H2O2) is a nonplanar molecule with (twisted) C 2 symmetry; this was first shown by Paul-Antoine Giguère in 1950 using infrared spectroscopy. [9] [10] Although the O−O bond is a single bond, the molecule has a relatively high rotational barrier of 386 cm −1 (4.62 kJ / mol) for rotation between enantiomers via the trans ...
Halo is an American military science fiction television series developed by Kyle Killen and Steven Kane for the streaming service Paramount+.Based on the video game franchise created by Bungie and developed by 343 Industries, the series follows a 26th-century war between the United Nations Space Command and the Covenant, a theocratic-military alliance of several alien races determined to ...
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Ronald Wilson Reagan ( / ˈreɪɡən / RAY-gən; February 6, 1911 – June 5, 2004) was an American politician and actor who served as the 40th president of the United States from 1981 to 1989. A member of the Republican Party, his presidency constituted the Reagan era, and he is considered one of the most prominent conservative figures in ...
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The HD resolution of 1280 × 720 pixels stems from high-definition television (HDTV), where it originally used 50 or 60 frames per second. With its 16:9 aspect ratio, it is exactly 2 times the width and 1 1 / 2 times the height of 4:3 VGA ( 640 × 480 ), which shares its aspect ratio and 480 line count with NTSC .
G7. The Group of Seven ( G7) is an intergovernmental political and economic forum consisting of Canada, France, Germany, Italy, Japan, the United Kingdom and the United States; additionally, the European Union (EU) is a "non-enumerated member". It is organized around shared values of pluralism, liberal democracy, and representative government.
Most lions now live in East and Southern Africa; their numbers are rapidly decreasing, and fell by an estimated 30–50% in the late half of the 20th century. Primary causes of the decline include disease and human interference. In 1975, it was estimated that since the 1950s, lion numbers had decreased by half to 200,000 or fewer.