THE DAILY FACT COLLECTION
100 facts from the Daily rotation. This is a collection, not a dated record of every past display. Open a fact for its explanation and source.
A large number is easier to remember when it changes a comparison. Distinguish rotation from orbit, distance from travel time, and apparent size from physical size. Read the qualification: “about” is often doing important scientific work.
Follow the idea →A striking feature becomes more useful when you connect it to a role. Ask what an organ does, which group an animal belongs to, and whether the claim describes every species or one particular example.
Follow the idea →Compare the clocks and distances, not just the numbers. A planet’s rotation and orbit answer different questions; a travel time needs a stated journey.
Rotation: about 243 Earth days. Orbit: about 225.
NASA Space Place · All about Venus ↗Its dense atmosphere traps heat.
NASA · Venus facts ↗Its cloud chemistry is very different from Earth's.
NASA · Venus facts ↗This Venus quasi-satellite's designation, 2002 VE, was misread.
NASA · Venus facts ↗The solar day is about 176 Earth days; the year is 88.
NASA · Mercury facts ↗It has almost no atmosphere to retain daytime heat.
NASA · Mercury facts ↗Many features honour deceased artists, musicians and writers.
NASA · Mercury facts ↗Its changing orbital speed interacts with its slow rotation.
NASA · Mercury facts ↗Oxidation colours the dust and rocks.
NASA · Mars facts ↗A Martian solar day is called a sol.
NASA · Mars facts ↗Its elliptical orbit makes their lengths uneven.
NASA · Mars facts ↗It may eventually break apart or collide with Mars.
NASA · Mars facts ↗They contain ice and rock, from grains to enormous chunks.
NASA · Saturn facts ↗A short rotation and a long orbit coexist.
NASA · Saturn facts ↗Saturn's moon has a much colder landscape than Earth.
NASA · Saturn facts ↗Its rotation axis is tilted about 98 degrees.
NASA · Uranus facts ↗Their names come from literary characters.
NASA · Uranus facts ↗Its almost sideways axis and roughly 84-year orbit produce long polar periods without sunlight. A roughly 21-year season is not the full polar night.
NASA · Uranus (Nov. 2014 and Nov. 2022) ↗Herschel observed it with a telescope in 1781.
NASA · Uranus facts ↗Laser measurements show a rate of nearly four centimetres per year.
NASA · Five things about the Moon ↗Scientists time laser light returning from these reflectors.
NASA · Five things about the Moon ↗They are recorded on gold-plated discs launched in 1977.
NASA · Voyager Golden Record overview ↗It presents Earth's natural sounds alongside music and greetings.
NASA · Voyager Golden Record overview ↗The station circles Earth roughly every 90 minutes.
NASA · First rays of an orbital sunrise ↗It is an atmospheric feature, not a mark on solid ground.
NASA · Jupiter facts ↗Being a moon describes what it orbits, not simply its size.
NASA · Jupiter facts ↗Predictions from Uranus's orbit guided the telescope search.
NASA · Neptune facts ↗His observations were in 1612 and 1613, long before its recognition as a planet.
NASA · Neptune facts ↗Surprising anatomy becomes memorable when you connect a feature to its job. Be careful about extending a claim about one animal to an entire group.
Two supply the gills; one supplies the body.
Natural History Museum · Octopuses ↗Their oxygen-carrying protein contains copper.
Natural History Museum · Octopuses ↗Small skin structures expand or retract for camouflage.
Natural History Museum · Octopuses ↗Researchers followed the same female in Monterey Canyon.
Robison et al. · PLOS ONE · 53-month brooding observation ↗The other arms help maintain their disguise.
Natural History Museum · Octopuses ↗It belongs to the egg-laying mammals, the monotremes.
Natural History Museum · The platypus puzzle ↗Venom is not limited to snakes and spiders.
Natural History Museum · The platypus puzzle ↗Taste receptors help them find food and suitable plants for eggs.
Natural History Museum · Butterfly feeder ↗This describes their ancient ancestry, not unchanged modern species.
Natural History Museum · Shark evolution ↗Milk comes from specialised glands in the pouch.
Natural History Museum · Echidnas ↗Their unusual flight also allows sustained hovering.
Smithsonian · Hummingbirds ↗Pigments from foods such as algae and shrimp colour their feathers.
Smithsonian · American flamingo ↗Keeping juvenile features into adulthood is called neoteny.
Natural History Museum · Axolotls ↗Wild individuals are generally mottled brown-grey.
Natural History Museum · Axolotls ↗The female transfers eggs into his brood pouch.
NOAA · Seahorses ↗In most males, a tooth grows into a long spiral tusk.
NOAA Fisheries · Narwhal ↗Scarabaeus satyrus uses the bright band on moonless nights.
Natural History Museum · Dung beetles ↗Their everyday name conceals their evolutionary relationships.
Smithsonian · Horseshoe crab ↗They belong within the dinosaur lineage, not just beside it.
Natural History Museum · Dinosaur evidence ↗A word’s past can connect apparently unrelated ideas. Its origin does not dictate every modern meaning, and naming something is not the same as inventing it.
Japanese e and moji form the word.
Merriam-Webster · emoji ↗Čapek's R.U.R. used a name linked to forced labour.
Merriam-Webster · robot ↗Pianoforte combines the Italian words for soft and loud.
Merriam-Webster · piano ↗Latin musculus is a diminutive of mus, mouse.
Merriam-Webster · muscle ↗It traces through Italian disastro to astro, a heavenly body.
Merriam-Webster · disaster ↗Both elements ultimately come from Greek.
Merriam-Webster · astronaut ↗Its Greek components are oxys and mōros.
Merriam-Webster · oxymoron ↗Its history leads back to al-Khwārizmī.
Merriam-Webster · algorithm ↗Kara means empty; ōke abbreviates orchestra in Japanese.
Merriam-Webster · karaoke ↗Its word history includes a term for a forty-day period.
Merriam-Webster · quarantine ↗A familiar screen can hide several different systems. Separate the service you use from the infrastructure that makes it possible.
It ran on Tim Berners-Lee's NeXT computer at CERN.
CERN · The birth of the Web ↗Berners-Lee developed it at CERN in 1989.
CERN · The birth of the Web ↗This helped anyone use and build on the technology.
CERN · The birth of the Web ↗The name refers to Harald Bluetooth.
Bluetooth SIG · Origin of the name ↗They represent H and B, for Harald Bluetooth.
Bluetooth SIG · Origin of the name ↗DENSO WAVE introduced the system in 1994.
DENSO WAVE · History of QR Code ↗The everyday name differed from the formal description.
Computer History Museum · The mouse ↗It came from Engelbart's research into computer interaction.
DARPA · First computer mouse ↗That is roughly 20 centimetres across.
IBM · Floppy disk storage ↗Ask what observation supports the claim. A number is a useful beginning, but the mechanism or measurement is what makes the fact explain something.
Heat makes its iron expand; cooling reverses the effect.
Eiffel Tower · Why does it change size? ↗Uneven heating makes the sunlit side expand more.
Eiffel Tower · Why does it change size? ↗Its melting point is below normal human body temperature.
Royal Society of Chemistry · Gallium ↗A distinctive spectral line revealed the element.
Royal Society of Chemistry · Helium ↗At ordinary pressure it has the highest melting point of the metals.
Royal Society of Chemistry · Tungsten ↗Its familiar liquid state is unusual among metals.
Royal Society of Chemistry · Mercury ↗Carbon's atomic arrangement changes its material properties.
Royal Society of Chemistry · Carbon ↗This brief heating can reach about 30,000°C.
NOAA · Lightning and thunder ↗Read the verb and the scope. An attribution, a surviving object and a documented event are different kinds of evidence about the past.
Physics in 1903 and Chemistry in 1911.
Nobel Prize · Marie Curie ↗It specifically recognised his discovery of its law.
Nobel Prize · The dual nature of light ↗Egyptian appears in hieroglyphic and demotic scripts, alongside Greek.
British Museum · Rosetta Stone ↗The element's name preserves that connection.
Nobel Prize · Marie Curie biography ↗Irène and Frédéric Joliot-Curie shared the 1935 prize.
Nobel Prize · Marie Curie biography ↗A tradition can be associated with a place without belonging only to that place. Shared practices deserve wording that leaves room for their wider history.
The famous set includes kings, queens and mounted knights.
British Museum · Lewis chessmen ↗Related traditions span communities across several countries.
UNESCO · Mongolian art of singing, Khoomei ↗Its copper exterior developed a patina over time.
National Park Service · Statue of Liberty facts ↗The name condenses leg godt.
LEGO · The LEGO Group history ↗The useful surprise is often a relationship: a structure and its function, or an organism and its surroundings. Resist turning a memorable example into a universal rule.
Each polyp is an animal, even when the colony resembles a plant.
NOAA · Corals ↗Coast redwoods lead in height; giant sequoias in overall volume.
National Park Service · Sequoias and redwoods ↗Botanical fruit categories follow structure, not everyday food names.
Kew · Musa itinerans ↗Photosynthetic plankton do much of the work; marine life also consumes oxygen.
NOAA · Oxygen from the ocean ↗A work can have a long life before and after its surviving text. Distinguish the story, its traditional attribution and a particular written version.
Beatrix Potter investigated spores as well as writing children's stories.
V&A · Introducing Beatrix Potter ↗Lewis Carroll was Charles Lutwidge Dodgson's pen name.
British Library · Lewis Carroll ↗Saint-Exupéry developed both the words and the pictures.
Morgan Library · The Little Prince ↗Writing, directing, composing and performing are separate contributions. Notice which credit a fact describes before attaching a famous name to it.
One full-size Oscar and seven small ones honoured the film.
Walt Disney Family Museum · Snow White ↗The sweep happened at the 2004 Academy Awards.
Academy · 2004 memorable moments ↗An idea, a name and a finished game are different things. Precise rules matter too: a familiar task can change when its action order changes.
Its story began with hanafuda cards in Kyoto.
Nintendo · History ↗Pajitnov combined the four-square pieces with his favourite sport.
The Tetris Company · About ↗Look for the exact claim: a material, a technique, an attribution or a date. Recognising an image is not the same as knowing its full history.
It was inspired by his view at Saint-Rémy, not copied exactly.
MoMA · The Starry Night ↗A map or clock describes the world using a convention. Ask which reference or definition the fact uses before comparing it with another description.
In Denmark Strait, cold dense water sinks below warmer water.
NOAA · Largest waterfall ↗Understanding a part’s role is more useful than memorising its name alone. These facts provide general background, not personal medical guidance.
Their height returns to normal after returning to Earth.
NASA · Spinal ultrasound investigation ↗The same words can suggest more than one reading. Context and structure matter, and uncertainty can be the correct conclusion.
Silbo Gomero encodes the spoken language as whistling.
UNESCO · Silbo Gomero ↗