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    Fact sources

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

    FactSource
    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