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
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
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.
A nuclear fission chain reaction —
An uranium-235 atom absorbs a neutron, and fissions into two (fission fragments), releasing three new neutrons and a large amount of binding energy.
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
An uranium-235 atom absorbs a neutron, and fissions into two (fission fragments), releasing three new neutrons and a large amount of binding energy.
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.
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
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