Contributor
RickStudent, Philosopher, Writer, Developer
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Ernest Walton
Photo Credit: By Nobel foundation - Public Domain, https://commons.wikimedia.org/w/index.php?curid=6181764
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Sir John Douglas Cockcroft
Photo Credit: By Nobel foundation -Public Domain, https://commons.wikimedia.org/w/index.php?curid=6181354
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Diagram of cyclotron operation from Lawrence's 1934 patent
Photo Credit: By Ernest O. Lawrence - U.S. Patent 1,948,384, Public Domain, https://commons.wikimedia.org/w/index.php?curid=543976
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USD, Coyote Village Residence Hall
Photo Credit: By Jrobb525 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=23167311
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logo for University of South Dakota
Photo Credit: By http://www.usd.edu/~/media/files/marketing-and-university-relations/graphic-standards-and-editorial-guide.ashx?la=en, Fair use, https://en.wikipedia.org/w/index.php?curid=56676327
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Ernest O. Lawrence
Photo Credit: By Nobel foundation - Public Domain, https://commons.wikimedia.org/w/index.php?curid=6186577
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Chicago Pile-1 — The first nuclear reactor was erected in 1942 in the West Stands section of Stagg Field at the University of Chicago. On December 2, 1942 a group of scientists achieved the first self-sustaining chain reaction and thereby initiated the controlled release of nuclear energy. The reactor consisted of uranium and uranium oxide lumps spaced in a cubic lattice embedded in graphite. In 1943 it was dismantled and reassembled at the Palos Park unit of the Argonne National Laboratory.
Photo Credit: By Melvin A. Miller of the Argonne National Laboratory - Public Domain, https://commons.wikimedia.org/w/index.php?curid=8147703
Chicago Pile-1 The first nuclear reactor was erected in 1942 in the West Stands section of Stagg Field at the University of Chicago. On December 2, 1942 a group of scientists achieved the first self-sustaining chain reaction and thereby initiated the controlled release of nuclear energy. The reactor consisted of uranium and uranium oxide lumps spaced in a cubic lattice embedded in graphite. In 1943 it was dismantled and reassembled at the Palos Park unit of the Argonne National Laboratory.
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A nuclear fission chain reaction
  1. An uranium-235 atom absorbs a neutron, and fissions into two (fission fragments), releasing three new neutrons and a large amount of binding energy.
  2. One of those neutrons is absorbed by an atom of uranium-238, and does not continue the reaction. Another neutron leaves the system without being absorbed. However, one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and more binding energy.

Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=522592
A nuclear fission chain reaction
  1. An uranium-235 atom absorbs a neutron, and fissions into two (fission fragments), releasing three new neutrons and a large amount of binding energy.
  2. One of those neutrons is absorbed by an atom of uranium-238, and does not continue the reaction. Another neutron leaves the system without being absorbed. However, one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and more binding energy.
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Title page of the assembly language code that produced Altair BASIC — Developed by Allen, Gates, and Monte Davidoff, with two early Microsoft business cards showing Gates as president and Allen as vice president
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=10631089
Title page of the assembly language code that produced Altair BASIC Developed by Allen, Gates, and Monte Davidoff, with two early Microsoft business cards showing Gates as president and Allen as vice president
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Microsoft logo/avatar — 2012–present: Fifth Microsoft logo, introduced on August 23, 2012
Photo Credit: By Microsoft Corporation - Public Domain, https://commons.wikimedia.org/w/index.php?curid=20799781
Microsoft logo/avatar 2012–present: Fifth Microsoft logo, introduced on August 23, 2012
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Bill Gates, 2017
Photo Credit: By Kuhlmann /MSC - https://securityconference.org/en/medialibrary/asset/bill-gates-1523-18-02-2017/, CC BY 3.0 de, https://commons.wikimedia.org/w/index.php?curid=100184908