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Each fact has a source below. The bank was checked on October 8, 2026. Report a correction with the fact and its source.

Fact	Source
Hydrogen has the chemical symbol H and atomic number 1.	Read source
Helium has the chemical symbol He and atomic number 2.	Read source
Lithium has the chemical symbol Li and atomic number 3.	Read source
Beryllium has the chemical symbol Be and atomic number 4.	Read source
Boron has the chemical symbol B and atomic number 5.	Read source
Carbon has the chemical symbol C and atomic number 6.	Read source
Nitrogen has the chemical symbol N and atomic number 7.	Read source
Oxygen has the chemical symbol O and atomic number 8.	Read source
Fluorine has the chemical symbol F and atomic number 9.	Read source
Neon has the chemical symbol Ne and atomic number 10.	Read source
Sodium has the chemical symbol Na and atomic number 11.	Read source
Magnesium has the chemical symbol Mg and atomic number 12.	Read source
Aluminum has the chemical symbol Al and atomic number 13.	Read source
Silicon has the chemical symbol Si and atomic number 14.	Read source
Phosphorus has the chemical symbol P and atomic number 15.	Read source
Sulfur has the chemical symbol S and atomic number 16.	Read source
Chlorine has the chemical symbol Cl and atomic number 17.	Read source
Argon has the chemical symbol Ar and atomic number 18.	Read source
Potassium has the chemical symbol K and atomic number 19.	Read source
Calcium has the chemical symbol Ca and atomic number 20.	Read source
Scandium has the chemical symbol Sc and atomic number 21.	Read source
Titanium has the chemical symbol Ti and atomic number 22.	Read source
Vanadium has the chemical symbol V and atomic number 23.	Read source
Chromium has the chemical symbol Cr and atomic number 24.	Read source
Manganese has the chemical symbol Mn and atomic number 25.	Read source
Iron has the chemical symbol Fe and atomic number 26.	Read source
Cobalt has the chemical symbol Co and atomic number 27.	Read source
Nickel has the chemical symbol Ni and atomic number 28.	Read source
Copper has the chemical symbol Cu and atomic number 29.	Read source
Zinc has the chemical symbol Zn and atomic number 30.	Read source
Silver has the chemical symbol Ag and atomic number 47.	Read source
Cadmium has the chemical symbol Cd and atomic number 48.	Read source
Tin has the chemical symbol Sn and atomic number 50.	Read source
Iodine has the chemical symbol I and atomic number 53.	Read source
Xenon has the chemical symbol Xe and atomic number 54.	Read source
Tungsten has the chemical symbol W and atomic number 74.	Read source
Gold has the chemical symbol Au and atomic number 79.	Read source
Mercury has the chemical symbol Hg and atomic number 80.	Read source
Lead has the chemical symbol Pb and atomic number 82.	Read source
Uranium has the chemical symbol U and atomic number 92.	Read source
Mercury is the smallest of the eight planets in our solar system.	Read source
A year on Mercury lasts about 88 Earth days.	Read source
Mercury has no natural moons.	Read source
A full sunrise-to-sunrise day on Mercury lasts about 176 Earth days.	Read source
Mercury is closest to the Sun, but Venus is the hotter planet.	Read source
Venus turns in the opposite direction to most planets in our solar system.	Read source
Venus is the hottest planet in our solar system because its thick atmosphere traps heat.	Read source
Venus has no natural moons.	Read source
Venus takes about 243 Earth days to rotate once, longer than its roughly 225-day year.	Read source
Venus is the brightest planet seen from Earth.	Read source
Earth is the only place in our solar system currently known to support life.	Read source
About 71 percent of Earth’s surface is covered by ocean.	Read source
Earth’s atmosphere is mostly nitrogen, with oxygen making up about 21 percent.	Read source
Earth has one natural moon.	Read source
Sunlight takes about eight minutes to reach Earth.	Read source
Rusting iron in rocks and dust gives Mars its reddish appearance.	Read source
Mars has two moons, Phobos and Deimos.	Read source
Olympus Mons on Mars is the largest volcano in our solar system.	Read source
Mars has a thin atmosphere made up mostly of carbon dioxide.	Read source
A Martian day is called a sol and lasts slightly longer than an Earth day.	Read source
Jupiter is the largest planet in our solar system.	Read source
Jupiter’s Great Red Spot is a giant storm.	Read source
Jupiter is a gas giant and has no solid outer surface to stand on.	Read source
Jupiter completes one rotation in about ten hours.	Read source
Jupiter has faint rings, although Saturn’s rings are much easier to see.	Read source
Saturn is the second-largest planet in our solar system.	Read source
Saturn’s spectacular rings are made mostly of pieces of ice, with rock and dust.	Read source
Saturn’s average density is lower than the density of water.	Read source
Saturn’s moon Titan has a thick atmosphere.	Read source
A year on Saturn lasts about 29 Earth years.	Read source
Uranus appears to roll around the Sun because its rotation axis is tilted almost onto its side.	Read source
Uranus was the first planet discovered using a telescope.	Read source
William Herschel discovered Uranus in 1781.	Read source
A year on Uranus lasts about 84 Earth years.	Read source
Methane in Uranus’s atmosphere helps give the planet its blue-green color.	Read source
Neptune was located through mathematical predictions before astronomers observed it as a new planet.	Read source
A year on Neptune lasts about 165 Earth years.	Read source
Neptune’s large moon Triton orbits in the opposite direction to Neptune’s rotation.	Read source
Neptune is an ice giant, along with Uranus.	Read source
Neptune has rings as well as moons.	Read source
George Washington served as US president number 1, in 1789 to 1797.	Read source
John Adams served as US president number 2, in 1797 to 1801.	Read source
Thomas Jefferson served as US president number 3, in 1801 to 1809.	Read source
James Madison served as US president number 4, in 1809 to 1817.	Read source
James Monroe served as US president number 5, in 1817 to 1825.	Read source
John Quincy Adams served as US president number 6, in 1825 to 1829.	Read source
Andrew Jackson served as US president number 7, in 1829 to 1837.	Read source
Martin Van Buren served as US president number 8, in 1837 to 1841.	Read source
William Harrison served as US president number 9, in 1841 to 1841.	Read source
John Tyler served as US president number 10, in 1841 to 1845.	Read source
James K. Polk served as US president number 11, in 1845 to 1849.	Read source
Zachary Taylor served as US president number 12, in 1849 to 1850.	Read source
Millard Fillmore served as US president number 13, in 1850 to 1853.	Read source
Franklin Pierce served as US president number 14, in 1853 to 1857.	Read source
James Buchanan served as US president number 15, in 1857 to 1861.	Read source
Abraham Lincoln served as US president number 16, in 1861 to 1865.	Read source
Andrew Johnson served as US president number 17, in 1865 to 1869.	Read source
Ulysses S. Grant served as US president number 18, in 1869 to 1877.	Read source
Rutherford B. Hayes served as US president number 19, in 1877 to 1881.	Read source
James A. Garfield served as US president number 20, in 1881 to 1881.	Read source
Chester A. Arthur served as US president number 21, in 1881 to 1885.	Read source
Grover Cleveland served as US president number 22 and 24, in 1885 to 1889 and 1893 to 1897.	Read source
Benjamin Harrison served as US president number 23, in 1889 to 1893.	Read source
William McKinley served as US president number 25, in 1897 to 1901.	Read source
Theodore Roosevelt served as US president number 26, in 1901 to 1909.	Read source
Eoraptor lived during the Triassic period and was carnivorous.	Read source
Stegosaurus lived during the Jurassic period and was herbivorous.	Read source
Allosaurus lived during the Jurassic period and was carnivorous.	Read source
Brachiosaurus lived during the Jurassic period and was herbivorous.	Read source
Tyrannosaurus lived during the Cretaceous period and was carnivorous.	Read source
Triceratops lived during the Cretaceous period and was herbivorous.	Read source
Abelisaurus lived during the Cretaceous period and was carnivorous.	Read source
Albertosaurus lived during the Cretaceous period and was carnivorous.	Read source
Irritator lived during the Cretaceous period and was carnivorous.	Read source
Cryolophosaurus lived during the Jurassic period and was carnivorous.	Read source
Compsognathus lived during the Jurassic period and was carnivorous.	Read source
Apatosaurus lived during the Jurassic period and was herbivorous.	Read source
Spinosaurus lived during the Cretaceous period and was carnivorous.	Read source
Carnotaurus lived during the Cretaceous period and was carnivorous.	Read source
Ceratosaurus lived during the Jurassic period and was carnivorous.	Read source
Dilophosaurus lived during the Jurassic period and was carnivorous.	Read source
Deinonychus lived during the Cretaceous period and was carnivorous.	Read source
Utahraptor lived during the Cretaceous period and was carnivorous.	Read source
Iguanodon lived during the Cretaceous period and was herbivorous.	Read source
Parasaurolophus lived during the Cretaceous period and was herbivorous.	Read source
Edmontosaurus lived during the Cretaceous period and was herbivorous.	Read source
Corythosaurus lived during the Cretaceous period and was herbivorous.	Read source
Maiasaura lived during the Cretaceous period and was herbivorous.	Read source
Lambeosaurus lived during the Cretaceous period and was herbivorous.	Read source
Hadrosaurus lived during the Cretaceous period and was herbivorous.	Read source
Pachycephalosaurus lived during the Cretaceous period and was herbivorous.	Read source
Styracosaurus lived during the Cretaceous period and was herbivorous.	Read source
Centrosaurus lived during the Cretaceous period and was herbivorous.	Read source
Chasmosaurus lived during the Cretaceous period and was herbivorous.	Read source
Pentaceratops lived during the Cretaceous period and was herbivorous.	Read source
The heart pumps blood throughout the body.	Read source
Heart valves help blood move in the correct direction.	Read source
The heart has an electrical system that controls its rhythm.	Read source
The circulatory system includes arteries, veins and capillaries.	Read source
Oxygen moves from inhaled air into the blood in the lungs.	Read source
The lungs transfer carbon dioxide from the blood into air that is breathed out.	Read source
The trachea is also called the windpipe.	Read source
The diaphragm is one of the muscles involved in breathing.	Read source
The cornea is the clear front layer of the eye and helps focus light.	Read source
The pupil is an opening through which light enters the eye.	Read source
The iris controls how much light the pupil admits.	Read source
Photoreceptors in the retina turn light into electrical signals.	Read source
The middle ear contains three tiny bones called the malleus, incus and stapes.	Read source
The cochlea is a fluid-filled, snail-shaped structure in the inner ear.	Read source
The auditory nerve carries electrical signals from the ear to the brain.	Read source
UTF-8 represents a Unicode character using one to four bytes.	Read source
An ASCII character uses one byte in UTF-8.	Read source
UTF-8 preserves the byte values of the ASCII character set.	Read source
Unicode code points extend up to U+10FFFF.	Read source
UTF-8 is an encoding of characters, rather than a particular font.	Read source
HTTP is a request-and-response protocol.	Read source
An HTTP status code contains three digits.	Read source
HTTP status code 404 means that the requested resource was not found.	Read source
HTTP status code 200 means that a request succeeded.	Read source
The HTTP HEAD method requests the same kind of headers as GET while omitting response content.	Read source
HTTP status codes in the 500 range describe server errors.	Read source
The Domain Name System organizes names in a hierarchy.	Read source
DNS resolvers obtain information by asking name servers.	Read source
A domain name consists of labels separated by dots in its written form.	Read source
The original JPEG image coding standard was created in 1992.	Read source
JPEG’s familiar lossy compression mode uses the discrete cosine transform.	Read source
PNG is a lossless raster image format.	Read source
PNG images can store an alpha channel for transparency.	Read source
SVG stands for Scalable Vector Graphics.	Read source
SVG describes two-dimensional graphics using an XML-based language.	Read source
Birmingham is a Census-recognized place in the US state of Alabama.	Read source
Huntsville is a Census-recognized place in the US state of Alabama.	Read source
Anchorage is a Census-recognized place in the US state of Alaska.	Read source
Fairbanks is a Census-recognized place in the US state of Alaska.	Read source
Phoenix is a Census-recognized place in the US state of Arizona.	Read source
Tucson is a Census-recognized place in the US state of Arizona.	Read source
Little Rock is a Census-recognized place in the US state of Arkansas.	Read source
Fort Smith is a Census-recognized place in the US state of Arkansas.	Read source
Los Angeles is a Census-recognized place in the US state of California.	Read source
San Francisco is a Census-recognized place in the US state of California.	Read source
Denver is a Census-recognized place in the US state of Colorado.	Read source
Colorado Springs is a Census-recognized place in the US state of Colorado.	Read source
Bridgeport is a Census-recognized place in the US state of Connecticut.	Read source
New Haven is a Census-recognized place in the US state of Connecticut.	Read source
Wilmington is a Census-recognized place in the US state of Delaware.	Read source
Dover is a Census-recognized place in the US state of Delaware.	Read source
Miami is a Census-recognized place in the US state of Florida.	Read source
Orlando is a Census-recognized place in the US state of Florida.	Read source
Atlanta is a Census-recognized place in the US state of Georgia.	Read source
Savannah is a Census-recognized place in the US state of Georgia.	Read source
The Gregorian calendar’s leap-year rule uses divisibility by 4, 100 and 400.	Read source
The year 1900 was not a Gregorian leap year.	Read source
The year 2000 was a Gregorian leap year.	Read source
The year 2100 will not be a Gregorian leap year.	Read source
The Gregorian leap-year pattern contains 97 leap years in every 400 years.	Read source
The average Gregorian calendar year is 365.2425 days long.	Read source
The Gregorian calendar was instituted in 1582.	Read source
The Julian calendar was introduced in 46 BC.	Read source
The Julian calendar added a leap day every fourth year.	Read source
A tropical year is approximately 365.2422 days long.	Read source