Manhattan Project
"Little Boy" and "Fat Man" Atomic Bombs
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Manhattan Project Facts: Fast Fact Sheet for kids
Fast, fun facts and Frequently Asked Questions (FAQ's)
about the Manhattan Project.
What was the Purpose of the Manhattan
Project? The purpose of the Manhattan
Project was to develop an Atomic Bomb. The
Little Boy atomic bomb dropped on Hiroshima
and the "Fat Man" atomic bomb was dropped on
Nagasaki
Why was it called the Manhattan Project?
It was called the Manhattan Project because
the program began under the Manhattan
Engineering District of the War Department
and its scientists worked in Columbia
University in Manhattan, NY
When did the Manhattan Project start?
The Manhattan Project started on May 12,
1942 when President Roosevelt signed an
order creating a top secret project to
develop the nuclear weapon.
Why was the
Manhattan Project kept top secret?
The Manhattan Project was kept top secret
for fear that the nuclear technology would
be stolen by enemy spies belonging to
Germany or Japan or fall into the hands of
the Russians. Info about the Manhattan
Project could be used to accelerate their
own nuclear projects or to mount covert
operations against the project.
Who were the Manhattan
Project scientists?
The famous scientists who worked on the Manhattan Project included
Robert Oppenheimer, Enrico Fermi, David Bohm, Leo Szilard, Vannevar
Bush, Walter Zinn , David Bohm, Herbert L. Anderson, Eugene Wigner,
Otto Frisch, Rudolf Peierls, Felix Bloch, John R. Dunning, Niels
Bohr, Emilio Segre, James Franck, Ernest O. Lawrence, Klaus Fuchs,
Arthur Wahl and Edward Teller.
Was Albert Einstein
involved in the Manhattan Project?
Hungarian physicist Leo Szilard was a friend and colleague of Albert
Einstein and well known for his pioneering work in nuclear physics.
Leo Szilard was the first to realize that nuclear power could be
used to build a bomb of terrifying proportions. The only involvement
Albert Einstein had in the Manhattan project were letters sent to
President Roosevelt. Albert Einstein first put his name to a letter,
dated August 2, 1939, written by Leo Szilard that was sent via Alexander
Sachs to FDR. Alexander Sachs, a trusted advisor,
had access to President Franklin D. Roosevelt. The letter informed
the President that "a nuclear chain reaction
in a large mass of uranium" was undoubtedly possible,
and could lead to the construction of "extremely
powerful bombs of a new type". The letter,
signed by Einstein, also warned that
Germany might be developing a nuclear weapon. In
response to the letter FDR set up the Advisory Committee on Uranium
to investigate the issue. The committee were not convinced by the
scientists and remained skeptical about the warning. Einstein sent
two more letters to President Roosevelt, on March 7, 1940, and April
25, 1940, calling for action on nuclear research. In 1941 the
committee were finally convinced when they met with British
scientists, who were already working on an atomic bomb, and read the
MAUD (Military Application of Uranium Detonation) report on the
British atomic bomb project. President Roosevelt signed an order
creating a secret project, called the Manhattan Project, to develop
the nuclear weapon. The reason Albert Einstein was not included in
the Manhattan Project was because in July 1940 the U.S. Army Intelligence office
had denied Albert Einstein the security clearance required to work on the
top secret Manhattan Project.
Manhattan Project Facts
for kids
The following fact
sheet contains interesting information, history and
facts on Manhattan Project for kids.
Manhattan Project
Facts for kids
Manhattan Project
Facts - 1: Science fiction writer H. G. Wells wrote about
the idea of using "Atomic Bombs" in his 1914 novel 'The World Set
Free' and predicted aerial bombardment and an imminent devastating
world war.
Manhattan Project
Facts -
2: US physicist Robert Oppenheimer and
General Leslie R. Groves served as directors of the
Manhattan Project
Manhattan Project
Facts - 3: The Manhattan Project employed
130,000 workers and, by the end of WW2, had cost $2.2
billion (about $26 billion in 2015 dollars).
Manhattan Project
Facts - 4: The Manhattan project took less than
4 years, and much of the work took place in vast
facilities in Oak Ridge, Tennessee, and Hanford,
Washington.
Manhattan Project
Facts - 5: Los Alamos, New Mexico was
selected as the site for Project Y, the code name for the main
atomic bomb scientific laboratory of the Manhattan Project. J. Robert Oppenheimer was
the director of the Los Alamos National Laboratory and responsible
for Project Y that designed the atomic bombs.
Manhattan Project
Facts - 6: The only mailing address for the secret Los
Alamos location was a post office box, number 1663, in Santa Fe, New
Mexico
Manhattan Project
Facts - 7: Two types of atomic bomb were
developed during WW2. A relatively simple gun-type
fission weapon was made using uranium-235 and a more
complex implosion-type weapon.
Manhattan Project
Facts - 8: The gun-assembled device, saw one
piece of fissionable material being fired at another
piece to produce the chain reaction and an atomic
explosion. Fission is the term given to the process of "splitting" atoms
through their bombardment by neutrons.
Manhattan Project
Facts - 9: The implosion device consisted of a plutonium sphere
surrounded by high explosives. Plutonium is a heavy
metal that does not exist naturally. It is produced as a
by-product of the fission process in a nuclear reactor.
Manhattan Project
Facts - 10: Radiation detectors were used as
safety measures in the Manhattan Project to measure employees clothing and work
areas, etc. Nose swabs were also used to detect the
inhalation of plutonium dust.
Manhattan Project
Facts - 11: Los Alamos scientist Harry Daghlian
and Physicist Louis Slotin both died of acute radiation
poisoning following accidents during "Tickling the
dragon's tail" experiments at Los Alamos. "Tickling the
dragon's tail" was a coined term for the criticality
experiments to determine the amount of fissionable
material needed for a sustained chain reaction. The two
men suffered days of the ravaging effects of radiation
sickness before they died.
Manhattan Project
Facts - 12: Oak Ridge and Hanford were used during the
Manhattan Project for the purpose
of obtaining sufficient quantities of the isotopes uranium-235 and
plutonium-239, that were necessary to produce the fission chain
reaction and release the destructive energy of the atomic bomb.
Continued...
Manhattan Project
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about the Manhattan Project Facts for kids
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sheet continues with interesting information, history and facts
on Manhattan Project for kids.
Manhattan Project
Facts for kids
Manhattan Project
Facts -
13: Glenn T. Seaborg and his team, working at the University of
California in Berkeley, discovered that plutonium is fissionable on
March 28, 1941
Manhattan Project
Facts - 14: Physicist Enrico Fermi supervised the
world's first controlled sustained chain reaction in
1942 underneath Stagg Field, the abandoned football
stadium at the University of Chicago.
Manhattan Project
Facts -
15: The Quebec Agreement, between the
United States and Great Britain, was signed on August
19, 1943. The Quebec Agreement outlined the terms of
coordinated development of the nuclear energy and the
weapons that employed nuclear energy.
Manhattan Project
Facts - 16: Following the Quebec Agreement a large team of
British and Canadian scientists moved to the United States to work
on the Manhattan Project.
Manhattan Project
Facts - 17: So many people were involved with the
Manhattan Project that a special Counter Intelligence
Corps was set up to handle the security issues. Lie
detection tests were a normal practice as part of the
security screening process.
Manhattan Project
Facts - 18: Despite being an ally during WW2, the
Soviet Union launched an all-out espionage effort and a
Soviet spy ring was established in the 1940s to uncover
the military secrets of the United States and Great
Britain.
Manhattan Project
Facts - 19: The most famous 'Atomic Spies' were
John Cairncross, Klaus Fuchs, Theodore Hall, Ethel and
Julius Rosenberg, George Koval, Lona and Morris Cohen,
Harry Gold and David Greenglass
Manhattan Project
Facts - 20: Ironically, many of the scientists involved in
making the atomic bomb had defected from Germany
Manhattan Project
Facts - 21: J. Robert Oppenheimer, director of the Manhattan
Project, is often called the "father
of the atomic bomb"
Manhattan Project
Facts - 22: Following the Trinity test, the code
name of the first detonation of a nuclear weapon called
'The Gadget', J. Robert Oppenheimer repeated the famous
quote "Now I am become Death, the destroyer of worlds."
The full quote is as follows:
Manhattan Project
Facts - 23: Hiroshima was chosen as the target
for the first atomic bomb because it was a large port
city with an army base. Hiroshima had not been damaged
much by earlier bombings during WW2 and the devastation
inflicted on the city would show the power of the new
atomic weapon.
Manhattan Project
Facts - 24: The initial target for the second
atomic bomb on August 9, 1945 was Kokura, but there was
too much cloud cover for visual targeting, so the
destination was changed to the backup target of Nagasaki
Manhattan Project
Facts -
25: Four different size casings were made for the
Atomic bombs and were given the code names of "The Gadget", "Fat
Man", "Thin Man" and "Little Boy".
Manhattan Project
Facts -
26: The code names for the bombs were
created by Robert Serber, an American physicist, who
worked on the Manhattan Project. Serber chose them based on
the design shapes of the atomic bombs constructed during
the Manhattan Project.
Manhattan Project
Facts -
27: The "Thin Man" was a long, thin
device, and the name was taken from the Dashiell Hammett
detective novel 'The Thin Man' although it was seen as
representing President Roosevelt.
Manhattan Project
Facts -
28: The "Fat Man" bomb was round and fat
and named after Sydney Greenstreet's character in movie
called 'The Maltese Falcon', although it was seen as
representing Winston Churchill.
Manhattan Project
Facts -
29: "The Gadget" was the code name given to the first
atomic bomb ever detonated. The term "Gadget" was a
laboratory euphemism for a bomb. The Manhattan Project atomic test, code
name Trinity, was conducted on July 16, 1945 by the
US Army on an isolated mesa at Alamogordo, New Mexico.
Manhattan Project
Facts -
30: The "Gadget" was detonated and
monitoring of the explosion took place in bunkers 10,000
yards (9 km) away occupied by scientists and a few
dignitaries.
Manhattan Project
Facts - 31: The atomic bomb explosion came as an intense
light flash, a sudden wave of heat, followed by a tremendous roar as
the shock wave passed and echoed in the valley. A ball of fire rose
rapidly, followed by a mushroom cloud extending to 40,000 feet
(12,200 metres). Much of the surrounding test area for the bomb was
vaporized.
Manhattan Project
Facts -
32: The "Gadget" atomic
bomb exploded with a 18,000 ton TNT equivalent and the explosion
created a crater which measured nearly 2,400 feet
across. The "Gadget" was an experimental test
version of the implosion system used in "Fat Man"
Manhattan Project
Facts - 33: The "Thin Man" was a proposed
plutonium gun-type nuclear bomb. Thin Man was 17 feet
(5.2 m) long, with a 38-inch (97 cm) wide tail, and a
23-inch (58 cm) mid section. Scientists abandoned the
"Thin Man" as the gun-type bomb using plutonium was
found to be impractical. It was replaced by the smaller
"Little Boy" bomb.
Manhattan Project
Facts -
34: The "Little Boy" atomic bomb was a
development of the unsuccessful "Thin Man" nuclear bomb,
gun-type fission weapon, using uranium rather than
plutonium. The "Little Boy" codename was chosen because
of its relationship to the "Thin Man".
Manhattan Project
Facts -
35: The "Little Boy" bomb was 10 feet
(3.0 m) long and 28 inches (71 cm) wide. The Little Boy
atomic bomb was the first nuclear weapon to be dropped
on Japan, targeting Hiroshima on August 6, 1945. Arming
of the "Little Boy" bomb began eight minutes into the
flight and took 25 minutes.
Manhattan Project
Facts - 36: The "Fat Man" atomic bomb was the
implosion model plutonium bomb, the second a-bomb on
Japan, that was dropped on Nagasaki on August 9, 1945.
It was 10.6 feet (3.3 m) long and 5 feet (1.5 m) wide. The Nagasaki "Fat Man" bomb was made from plutonium,
which was even more powerful than uranium.
Manhattan Project
Facts -
37: Project Alberta, also known as
Project A, was a section of the Manhattan Project that
prepared for the delivery of atomic weapons during
combat by conducting weapons delivery tests and
modifying aircraft for carrying the atomic weapons
developed by the Manhattan Project.
Manhattan Project
Facts - 38: The B-29 Super-fortress bomber was remodeled to
deliver the Atomic bomb in the Manhattan Project. The organization and training of flight
crews and field teams for weapons handling was an important element
of Project Alberta. Colonel Paul Tibbets
and the 393rd Bombardment Squadron begin test drops with
dummy bombs called "Pumpkins".
Manhattan Project
Facts - 39: Colonel Paul Tibbets
and the 393rd Bombardment Squadron begin test drops with
dummy bombs called "Pumpkins". The "pumpkins"
were mustard colored and were of the approximate size and weight of
the "Fat Man" bomb.
Manhattan Project
Facts - 40: The Enola Gay was the name was painted on the
Boeing B-29 Superfortress bomber that became the first aircraft to
drop an atomic bomb. The Enola Gay dropped the atomic bomb,
code-named "Little Boy" on the city of Hiroshima, Japan on August 6,
1945. The aircraft was named for Enola Gay Tibbets, the mother of
the pilot, Colonel Paul Tibbets.
Manhattan Project
Facts -
41: Bockscar was the name given to the
B-29 Superfortress that dropped the second atomic bomb,
"Fat Boy", on the Japanese city of Nagasaki on August 9, 1945.
The "Fat Boy" plutonium bomb did not require arming in
flight
Manhattan Project
Facts - 42: 60,000 people were killed instantly
at Hiroshima, and another 200,000 subsequently died as a
result of burn and radiation injuries. The atomic bomb
dropped at Nagasaki missed its actual target by over a
mile. The bomb killed or injured more than 65,000 people
and destroyed half of the city.
Manhattan Project
Facts - 43: The Manhattan Project changed the
entire way warfare would be fought forever.
Manhattan Project
Facts for kids
Manhattan Project Facts for kids - President Franklin Roosevelt Video
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Manhattan Project Facts provides detailed facts and a summary of one of the important events during his presidential term in office. The following
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give you additional important facts and dates about the political events experienced by the 32nd American President whose presidency spanned from March 4, 1933 to April 12, 1945.
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Franklin Roosevelt
Presidency from March 4, 1933 to April 12, 1945
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