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Ernest O. Lawrence —
Photo Credit: By Nobel foundation - Public Domain, https://commons.wikimedia.org/w/index.php?curid=6186577
Ernest O. Lawrence
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.
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.
<ol><li>An uranium-235 atom absorbs a neutron, and fissions into two (fission fragments), releasing three new neutrons and a large amount of binding energy.</li><li>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.</li><li><Both of those neutrons collide with uranium-235 atoms, each of which fissions and releases a few neutrons, which can then continue the reaction.</li></ol>
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.
Developed by Allen, Gates, and Monte Davidoff, with two early Microsoft business cards showing Gates as president and Allen as vice president
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
2012–present: Fifth Microsoft logo, introduced on August 23, 2012
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
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
Bill Gates, 2017
Paul Allen (left) with Bill Gates at Lakeside School in 1970 —
Photo Credit: By Bruce Burgess - Public Domain, https://commons.wikimedia.org/w/index.php?curid=89764229
Paul Allen (left) with Bill Gates at Lakeside School in 1970
Paul G. Allen —
Photo Credit: By Miles Harris - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=73641437
Paul G. Allen
A neutron is absorbed by the nucleus of a uranium-235 atom, which in turn splits into fast-moving lighter elements (fission products) and free neutrons. Though both reactors and nuclear weapons rely on nuclear chain reactions, the rate of reactions in a reactor is much slower than in a bomb.
An example of an induced nuclear fission event — A neutron is absorbed by the nucleus of a uranium-235 atom, which in turn splits into fast-moving lighter elements (fission products) and free neutrons. Though both reactors and nuclear weapons rely on nuclear chain reactions, the rate of reactions in a reactor is much slower than in a bomb.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=486924
An example of an induced nuclear fission event A neutron is absorbed by the nucleus of a uranium-235 atom, which in turn splits into fast-moving lighter elements (fission products) and free neutrons. Though both reactors and nuclear weapons rely on nuclear chain reactions, the rate of reactions in a reactor is much slower than in a bomb.
he Einstein–Szilard letter —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=2679498
he Einstein–Szilard letter
FDR response to the Einstein–Szilard letter —
Photo Credit: By Franklin Delano Roosevelt - Public Domain, https://commons.wikimedia.org/w/index.php?curid=2842619
FDR response to the Einstein–Szilard letter
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