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Approximately 860,000 abortions were performed in 2017, rising to about 930,000 in 2020. From 1973 to 1983, the abortion ratio reported by the Guttmacher Institute rose about 60%, peaking at 30.4 in 1983. From 1984 through 2016, the abortion ratio fell about 40%. It hit a low of 18.3 in 2016 and rose to 20.6 in 2020.
US timeline graphs of number of people incarcerated in jails and prisons Incarceration in the United States is one of the primary means of punishment for crime in the United States . In 2021, over five million people were under supervision by the criminal justice system, [2] [3] with nearly two million people incarcerated in state or federal ...
Lists of. Billboard. number-one singles. This is a list of songs that have peaked at number one on the Billboard Hot 100 and the magazine's national singles charts that preceded it. Introduced in 1958, the Hot 100 is the pre-eminent singles chart in the United States, currently monitoring the most popular singles in terms of popular radio play ...
813/.54 19. LC Class. PS3569.A287 C6 1985. Contact is a 1985 hard science fiction novel by American scientist Carl Sagan. It deals with the theme of contact between humanity and a more technologically advanced extraterrestrial life form. It ranked No. 7 on the 1985 U.S. bestseller list.
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In fluid mechanics, the Rayleigh number ( Ra, after Lord Rayleigh [1]) for a fluid is a dimensionless number associated with buoyancy -driven flow, also known as free (or natural) convection. [2] [3] [4] It characterises the fluid's flow regime: [5] a value in a certain lower range denotes laminar flow; a value in a higher range, turbulent flow.
Telephone number pooling. Telephone number pooling, thousands-block number pooling, or just number pooling, is a method of allocating telephony numbering space of the North American Numbering Plan in the United States. The method allocates telephone numbers in blocks of 1,000 consecutive numbers of a given central office code to telephony ...
The Prandtl number ( Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, defined as the ratio of momentum diffusivity to thermal diffusivity. [1] The Prandtl number is given as: where: ν {\displaystyle u } : momentum diffusivity ( kinematic viscosity ),