📚 Research & References

Why this page exists

Every design choice on this site — no timer, quizzes instead of passive reading, spaced daily review, Curiosity Corner on the homepage, Look-Cover-Write-Check for spelling — is based on real published research, not guesswork. This page lists every one of those sources, plus every source behind every fact in Curiosity Corner, in full.

Learning Science

The research behind how the site is built. References in Harvard style.

• Frontiers in Psychology (2025) Retrieval practice enhances learning in real primary school settings, whether distributed or not. Available at: https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2025.1632206/full
  Used to inform: Retrieval-practice quizzes across every subject on the site, rather than passive re-reading.
• Frontiers in Psychology (2016) Retrieval-Based Learning: Positive Effects of Retrieval Practice in Elementary School Children. Available at: https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2016.00350/full
  Used to inform: Retrieval-practice quizzes across every subject on the site, rather than passive re-reading.
• National Institutes of Health / PMC (n.d.) Effects of Math Anxiety and Perfectionism on Timed versus Untimed Math Testing in Mathematically Gifted Sixth Graders. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2806671/
  Used to inform: The site's 'no timer, ever' policy.
• ResearchGate (n.d.) Heightened test anxiety among young children: Elementary school students' anxious responses to high-stakes testing. Available at: https://www.researchgate.net/publication/238061980_Heightened_test_anxiety_among_young_children_Elementary_school_students'_anxious_responses_to_high-stakes_testing
  Used to inform: The site's low-pressure, no-timer, no-account approach generally.
• Metcalfe, J., Kornell, N. and Finn, B. (2009) Delayed versus immediate feedback in children's and adults' vocabulary learning. Memory & Cognition. Available at: https://pubmed.ncbi.nlm.nih.gov/19933453/
  Used to inform: The site's immediate right/wrong feedback after each answer — including the honest limits of that choice.
• Gruber, M.J., Gelman, B.D. and Ranganath, C. (2014) States of Curiosity Modulate Hippocampus-Dependent Learning via the Dopaminergic Circuit. Neuron. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC4252494/
  Used to inform: Curiosity Corner's placement on the homepage, before practice begins.
• Cracking the ABC Code (n.d.) The Problem with Look-Cover-Write as a Spelling Strategy. Available at: https://crackingtheabccode.com/problem-look-cover-write-spelling-strategy/
  Used to inform: The Look-Cover-Write-Check method used on the Spelling page, and its limits.
• Dymock, S. and Nicholson, T. (2017) 'To what extent does children's spelling improve as a result of learning words with the look, say, cover, write, check, fix strategy compared with phonological spelling strategies?'. Australian Journal of Learning Difficulties. Available at: https://www.researchgate.net/publication/321087057_To_what_extent_does_children's_spelling_improve_as_a_result_of_learning_words_with_the_look_say_cover_write_check_fix_strategy_compared_with_phonological_spelling_strategies
  Used to inform: The Look-Cover-Write-Check method used on the Spelling page, and its limits.

Past Papers

Every past paper linked from the Past Papers page comes from one of two sources: official gov.uk assessment archives (2024–2026), or sats-papers.co.uk (2011–2023), a long-established free archive of official past papers. Every individual link was checked directly rather than taken on trust.

Curiosity Corner — Every Fact Source

All 100 facts in Curiosity Corner are drawn from real institutions — space agencies, natural history museums, universities and scientific bodies — never invented or approximated. Every distinct source used, in full:

Show all sources (85 references, 49 organisations)

• BBC Discover Wildlife (n.d.) Available at: https://www.discoverwildlife.com/animal-facts/insects-invertebrates/how-strong-is-spider-silk
• Britannica (n.d.) Available at: https://www.britannica.com/place/Olympus-Mons
• British Antarctic Survey (n.d.) Available at: https://www.bas.ac.uk/about/antarctica/geography/ice/
• British Association of Dermatologists (n.d.) Available at: https://www.skinhealthinfo.org.uk/support-resource/nail-health/
• British Heart Foundation (n.d.) Available at: https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/how-your-heart-works
• CERN (n.d.) Available at: https://home.cern/science/accelerators/large-hadron-collider
• CERN (n.d.) Available at: https://home.cern/science/physics/higgs-boson
• CERN (n.d.) Available at: https://home.cern/about
• CERN (n.d.) Available at: https://home.cern/science/computing/birth-web
• CERN (n.d.) Available at: https://home.cern/science/physics/antimatter
• CERN (n.d.) Available at: https://home.cern/about/who-we-are
• Dictionary.com (n.d.) Available at: https://www.dictionary.com/e/s/flamboyance-flamingos-brilliant-bird-groups/
• English Heritage (n.d.) Available at: https://www.english-heritage.org.uk/visit/places/stonehenge/history-and-stories/history/
• English Heritage (n.d.) Available at: https://www.english-heritage.org.uk/learn/histories/roman-britain/roman-roads/
• History Hit (n.d.) Available at: https://www.historyhit.com/the-anglo-zanzibar-war-the-shortest-war-in-history-which-lasted-38-minutes/
• Kew Gardens (n.d.) Available at: https://www.kew.org/read-and-watch/bamboo-facts
• Lawrence Livermore National Laboratory (n.d.) Available at: https://www.llnl.gov/article/43621/scientists-create-diamond-rain-forms-interior-icy-giant-planets-neptune
• McGill Office for Science and Society (n.d.) Available at: https://www.mcgill.ca/oss/article/did-you-know-infographics/there-are-more-ways-arrange-deck-cards-there-are-atoms-earth
• Met Office (n.d.) Available at: https://www.metoffice.gov.uk/weather/learn-about/weather/uk-climate/extremes
• Museum of London (n.d.) Available at: https://www.museumoflondon.org.uk/discover/what-caused-great-fire-london
• NASA (n.d.) Available at: https://www.nasa.gov/image-article/great-wall/
• NASA (n.d.) Available at: https://science.nasa.gov/venus/venus-facts/
• NASA (n.d.) Available at: https://science.nasa.gov/jupiter/jupiter-facts/
• NASA (n.d.) Available at: https://science.nasa.gov/mars/facts/
• NASA (n.d.) Available at: https://science.nasa.gov/saturn/facts/
• NASA (n.d.) Available at: https://science.nasa.gov/moon/facts/
• NASA (n.d.) Available at: https://science.nasa.gov/sun/facts/
• NASA (n.d.) Available at: https://science.nasa.gov/universe/black-holes/
• NASA (n.d.) Available at: https://www.nasa.gov/international-space-station/
• NASA (n.d.) Available at: https://science.nasa.gov/universe/stars/
• NASA (n.d.) Available at: https://science.nasa.gov/mission/hubble/science/science-highlights/milky-way/
• NASA (n.d.) Available at: https://science.nasa.gov/uranus/facts/
• NASA (n.d.) Available at: https://science.nasa.gov/neptune/facts/
• NASA (n.d.) Available at: https://gpm.nasa.gov/resources/faq/how-often-does-lightning-strike
• National Geographic (n.d.) Available at: https://www.nationalgeographic.com/animals/article/insects-butterflies-anatomy-senses-animals
• National Geographic (n.d.) Available at: https://www.nationalgeographic.com/animals/article/dolphins-whistle-names-signature
• National Geographic Education (n.d.) Available at: https://education.nationalgeographic.org/resource/desert/
• National Geographic Education (n.d.) Available at: https://education.nationalgeographic.org/resource/pacific-ocean/
• National Geographic Education (n.d.) Available at: https://education.nationalgeographic.org/resource/river/
• Natural History Museum (n.d.) Available at: https://www.nhm.ac.uk/discover/octopuses-keep-surprising-us-here-are-eight-examples-how.html
• Natural History Museum (n.d.) Available at: https://www.nhm.ac.uk/discover/immortal-jellyfish-secret-to-cheating-death.html
• Natural History Museum (n.d.) Available at: https://www.nhm.ac.uk/discover/shark-evolution-a-450-million-year-timeline.html
• Natural History Museum (n.d.) Available at: https://www.nhm.ac.uk/discover/mantis-shrimp-natures-fiercest-puncher.html
• Natural History Museum (n.d.) Available at: https://www.nhm.ac.uk/discover/tardigrades-natures-toughest-animals.html
• NOAA (n.d.) Available at: https://oceanexplorer.noaa.gov/facts/mariana-trench.html
• NOAA Fisheries (n.d.) Available at: https://www.fisheries.noaa.gov/feature-story/big-hearted-blue-whale
• Official Eiffel Tower site (n.d.) Available at: https://www.toureiffel.paris/en/news/history-and-culture/why-does-eiffel-tower-change-size
• Ornitheology (n.d.) Available at: https://www.ornitheology.com/post/murder-of-crows-collective-bird-names
• PBS News (n.d.) Available at: https://www.pbs.org/newshour/science/the-secret-to-turtle-hibernation-butt-breathing
• PBS NOVA (n.d.) Available at: https://www.pbs.org/wgbh/nova/article/koala-fingerprints/
• Royal Horticultural Society (n.d.) Available at: https://www.rhs.org.uk/wildlife/how-to-help-bees
• Royal Institution (n.d.) Available at: https://www.rigb.org/explore-science/explore/blog/bone-strength
• Royal Meteorological Society (n.d.) Available at: https://www.rmets.org/metmatters/snow-fact-file
• Royal Meteorological Society (n.d.) Available at: https://www.rmets.org/metmatters/how-are-rainbows-formed
• Royal Museums Greenwich (n.d.) Available at: https://www.rmg.co.uk/stories/topics/greenwich-meridian-line
• Scientific American (n.d.) Available at: https://www.scientificamerican.com/article/human-nose-can-detect-1-trillion-odors/
• Scientific American (n.d.) Available at: https://www.scientificamerican.com/article/how-many-cells-are-in-the-body/
• Scientific American (n.d.) Available at: https://www.scientificamerican.com/article/people-do-use-100-percent-of-their-brains/
• Seattle Aquarium (n.d.) Available at: https://www.seattleaquarium.org/animal/sea-otter/
• Smithsonian Magazine (n.d.) Available at: https://www.smithsonianmag.com/science-nature/the-science-behind-honeys-eternal-shelf-life-1218690/
• Smithsonian Magazine (n.d.) Available at: https://www.smithsonianmag.com/smart-news/scientists-have-solved-mystery-how-wombats-poop-cubes-180976898/
• Smithsonian Magazine (n.d.) Available at: https://www.smithsonianmag.com/smart-news/geologists-reveal-a-surprising-reason-why-mount-everest-grows-taller-each-year-180985175/
• Smithsonian Magazine (n.d.) Available at: https://www.smithsonianmag.com/smart-news/elephants-may-recognize-themselves-in-mirror-180970797/
• Smithsonian National Air and Space Museum (n.d.) Available at: https://airandspace.si.edu/explore/stories/wright-brothers-first-flight
• Smithsonian Ocean (n.d.) Available at: https://ocean.si.edu/ocean-life/invertebrates/sea-stars-urchins-and-relatives
• Smithsonian's National Zoo (n.d.) Available at: https://nationalzoo.si.edu/animals/ostrich
• Smithsonian's National Zoo (n.d.) Available at: https://nationalzoo.si.edu/animals/hummingbird
• The British Museum (n.d.) Available at: https://www.britishmuseum.org/collection/object/Y_EA24
• The Humane League (n.d.) Available at: https://thehumaneleague.org/article/do-cows-have-best-friends
• The Royal College of Physicians (n.d.) Available at: https://history.rcp.ac.uk/blog/edward-jenner-and-discovery-vaccination
• The Royal Society (n.d.) Available at: https://royalsociety.org/people/alexander-fleming/
• The Royal Society for the Protection of Birds (n.d.) Available at: https://www.rspb.org.uk/birds-and-wildlife/advice/how-you-can-help-birds/animal-aid/owl-faqs
• The Science Museum (n.d.) Available at: https://www.sciencemuseum.org.uk/objects-and-stories/ada-lovelace
• The Woodland Trust (n.d.) Available at: https://www.woodlandtrust.org.uk/trees-woods-and-wildlife/british-trees/a-z-of-british-trees/oak/
• UK Parliament (n.d.) Available at: https://www.parliament.uk/about/living-heritage/building/palace/big-ben/
• US Department of Agriculture (n.d.) Available at: https://www.usda.gov/about-usda/news/blog/methuselah-bristlecone-pine-thought-be-oldest-living-organism-earth
• US Department of Energy (n.d.) Available at: https://www.energy.gov/ne/articles/5-radioactive-products-we-use-every-day
• US Geological Survey (n.d.) Available at: https://www.usgs.gov/water-science-school/science/how-much-does-a-cloud-weigh
• US Geological Survey (n.d.) Available at: https://www.usgs.gov/programs/earthquake-hazards/cool-earthquake-facts
• US Geological Survey (n.d.) Available at: https://www.usgs.gov/programs/VHP
• US National Human Genome Research Institute (n.d.) Available at: https://www.genome.gov/genetics-glossary/Deoxyribonucleic-Acid
• US National Park Service (n.d.) Available at: https://www.nps.gov/seki/learn/nature/bigtrees.htm
• US National Park Service (n.d.) Available at: https://www.nps.gov/redw/learn/nature/tallest-tree.htm
• US National Weather Service (n.d.) Available at: https://www.weather.gov/safety/lightning-temperature
• World Wildlife Fund (n.d.) Available at: https://www.worldwildlife.org/places/amazon