Photographs and diagrams in this study site come from Wikimedia Commons and are used under their free licences (public domain, CC0, CC BY or CC BY-SA). The authors and licences of each file can be found on its Commons page by searching for the file name listed below. Diagrams drawn specially for this site are original. This is a private, non-commercial learning page.
abacus-china.jpg (Chinese-abacus.jpg), napiers-bones.jpg (Napier's Bones circa 1700, Computer History Museum.jpg), pascaline.jpg (Arts et Metiers Pascaline dsc03869.jpg), leibniz.jpg (Leibnitzrechenmaschine.jpg), jacquard-cards.jpg (Jacquard.loom.cards.jpg), difference-engine.jpg (Babbage Difference Engine.jpg), babbage.jpg (Charles Babbage - 1860.jpg), ada-lovelace.jpg (Ada Lovelace portrait.jpg), hollerith.jpg (HollerithMachine.CHM.jpg), mark1.jpg (Harvard Mark I Computer - Left Segment.jpg), eniac.jpg (Glen Beck and Betty Snyder program the ENIAC…), univac.jpg (Univac I Census dedication.jpg), vacuum-tubes.jpg (Elektronenroehren-auswahl.jpg), transistors.jpg (Transistorer (cropped).jpg), ic-chips.jpg (Microchips.jpg), intel-4004.jpg (Intel C4004.jpg), laptop.jpg (MacBook Pro Retina 001.jpg), python-logo.png (Python-logo-notext.svg render), idle-shell.jpg (Python 3.2.2's IDLE Shell.jpg). Inline SVGs authored: Analytical Engine parts, generations strip, software family tree, fragmentation/defragmentation, Word Home-tab ribbon mock (hotspots), superscript/subscript, shadow, header/footer pages, columns, margins, orientation, ruler indent markers, variable boxes.
| File | Commons source | |---|---| | herd-elephants.jpg | File:Herd of elephants in Dhikala chaur AJTJ DSCN8222.jpg | | flock-sheep.jpg | File:Cologne Germany Flock-of-sheep-01.jpg | | school-fish.jpg | File:School of sardines at the Monterey Bay Aquarium (12056).jpg | | pride-lions.jpg | File:Lions Family Portrait Masai Mara.jpg | | swarm-bees.jpg | File:Swarm of bees - Ivory Coast.jpg | | bouquet.jpg | File:Rose and carnation flower bouquet 01.jpg | | flock-birds.jpg | File:Flock of sandpipers (72255).jpg | | bunch-grapes.jpg | File:Table grapes on white.jpg | Licences were not checked one by one. Commons hosts only free-licensed or public-domain files, but most need attribution if the site is ever made public. The letter layout, degrees-of-comparison towers and picture-composition park scene are inline SVGs made for this site.
tagore.jpg (Rabindranath Tagore in 1909), ruskin-bond.jpg (Ruskin Bond in Bangalore, cropped, by Jim Ankan Deka), kastner.jpg (Erich Kästner 1961, cropped), farjeon.jpg (Eleanor Farjeon), hockey-1928.jpg (Canada vs Switzerland ice hockey, St Moritz 1928/29), jalebi.jpg (Jalebi PK013), old-rupee.jpg (One Rupee Coin, George VI, 1947, British India). The diagrams (solutions flow, barter chain, chase route, three greens, couplet rhymes) are inline SVGs I drew myself.
All photos from Wikimedia Commons (file name → licence, author). Files named q-*.svg in assets/img/maths/ are original diagrams drawn for this site (no licence needed). - `assets/img/maths/chocolate-bar.jpg` — Commons: "File:Toms Guldbarre Chocolate Bar In Pieces.jpg" — CC BY-SA 3.0 — Knud Winckelmann - `assets/img/maths/church-clock.jpg` — Commons: "File:Darfield All Saints Church clock face - geograph.org.uk - 934144.jpg" — CC BY-SA 2.0 — Steve F - `assets/img/maths/cornerstone-1909.jpg` — Commons: "File:Chambers St Centre St td (2022-03-04) 23 - Manhattan Municipal Building.jpg" — CC BY-SA 4.0 — Tdorante10 - `assets/img/maths/cornerstone-1928.jpg` — Commons: "File:OLo Mt Carmel WhP cornerstone 2021 jeh.jpg" — CC BY 4.0 — Jim.henderson - `assets/img/maths/earth.jpg` — Commons: "File:The Earth seen from Apollo 17.jpg" — Public domain — NASA/Apollo 17 crew; taken by either Harrison Schmitt or Ron - `assets/img/maths/eden-gardens.jpg` — Commons: "File:The Mecca of Indian Cricket.jpg" — CC BY-SA 4.0 — Srijitdutta.10 - `assets/img/maths/egg-carton-6.jpg` — Commons: "File:Egg cartons with chicken eggs 03.jpg" — CC BY-SA 4.0 — Krzysztof Golik - `assets/img/maths/egg-tray-30.jpg` — Commons: "File:Empty cardboard egg crate.jpg" — CC BY-SA 4.0 — ChimaBee - `assets/img/maths/four-instruments.jpg` — Commons: "File:FourMetricInstruments.JPG" — CC BY-SA 3.0 — Martinvl - `assets/img/maths/indian-coins.jpg` — Commons: "File:Coins of the Indian rupee.png" — CC BY-SA 4.0 — ChiK - `assets/img/maths/kumbh-crowd.jpg` — Commons: "File:2019 Feb 04 - Kumbh Mela - Mauni Amavasya Crowd at 6am.jpg" — CC BY-SA 4.0 — Michael T Balonek - `assets/img/maths/mangoes.jpg` — Commons: "File:Mango fruits.JPG" — CC BY-SA 3.0 — Bhaskaranaidu - `assets/img/maths/masons.jpg` — Commons: "File:Masons plastering the brick walk.jpg" — CC BY-SA 4.0 — రవిచంద్ర - `assets/img/maths/notebooks.jpg` — Commons: "File:Notebooks-rainbow.jpg" — CC0 — utroja0 - `assets/img/maths/orange-segments.jpg` — Commons: "File:Oranges - whole-halved-segment.jpg" — CC BY-SA 4.0 — Ivar Leidus - `assets/img/maths/petrol-pump.jpg` — Commons: "File:Hp petrol Pump Arattukuzhi.jpg" — CC BY-SA 4.0 — Manukrishnan80 - `assets/img/maths/pizza-8-slices.jpg` — Commons: "File:Whole cheese pizza sliced into eight pieces inside a cardboard delivery box.jpg" — CC BY-SA 4.0 — Oleg Yunakov - `assets/img/maths/rice-stall.jpg` — Commons: "File:Toledo Market Traditional Rice Stall.jpg" — CC BY-SA 4.0 — QueenCityCebu - `assets/img/maths/roman-clock.jpg` — Commons: "File:Roman numerals on alarm clock (Unsplash).jpg" — CC0 — Ales Krivec aleskrivec - `assets/img/maths/tape-ruler.jpg` — Commons: "File:3cm - Flickr - wwarby.jpg" — CC BY 2.0 — William Warby from London, England - `assets/img/maths/vegetable-vendor.jpg` — Commons: "File:Vegetable market, Bulandshahr.jpg" — CC BY-SA 4.0 — Whispyhistory
| File | Commons source | Licence | |---|---|---| | skeleton.png | File:Human skeleton front en.svg | Public domain | | skeleton-blank.png | File:Human skeleton front - no labels.svg | Public domain | | flower-parts.png | File:Mature flower diagram.svg | Public domain | | germination.png | File:Sequential Steps of Bean Seedling Germination.svg | CC0 | | bee-pollination.jpg | File:Bee pollinating a rose.jpg | CC BY-SA 3.0 | | dandelion.jpg | File:Dandelion seed head (Taraxacum officinale).jpg | CC BY-SA 4.0 | | maple-seeds.jpg | File:Acer pseudoplatanus MHNT.BOT.2004.0.461.jpg | CC BY-SA 4.0 | | ear.png | File:Anatomy of the Human Ear.svg | CC BY 2.5 | | tuning-fork.jpg | File:Tuning Fork 288 HZ.jpg | CC0 | | handwashing.jpg | File:Washing hands with soap (1).jpg | CC BY-SA 4.0 | | mosquito.jpg | File:Aedes aegypti.jpg | GFDL 1.2 | Inline SVG diagrams drawn for this site: the four joint types, the food pyramid, a flower to label (hotspots), a bean seed to label (hotspots), a vibrating string, sound in solids, liquids and gases, and high vs low pitch. Added in the content review: rib cage and backbone, biceps/triceps pair, good vs bad posture, the three food groups, a corrected four-level food pyramid, a balanced thali, the housefly germ chain, and fertilisation (pollen tube to ovule).
aeroplane (IndiGo A320), ambedkar (1948 photo), bell, benz-car (1886 Patent Motorwagen), bhimbetka (rock painting), bullock-cart (Umaria MP), container-ship, evm (control unit), fairy-queen, gutenberg-press.png (replica), handloom, marconi (1897), metro (Delhi), morse, palanquin (Mehrangarh), parliament-new, parliament-old, pigeon (homing pigeons), post-box (India Post), potter, preamble (plaque), preamble-original (illuminated original page), radio-set, rajendra-prasad, rocket (Stephenson's Rocket), rourkela-steel (SMS, RSP), rourkela-steel2 (RSP chimneys), sailing-ship (Mayflower II), satellite.png (GSAT-9 render), tea-garden (Assam), telegraph (key and sounder), telephone-old (candlestick), ur-cart (Standard of Ur wagon), vande-bharat, vasco-da-gama, voting-ink, watt-engine.
All from Wikimedia Commons (free licences). Files: anthill.jpg, bamboo.jpg, bankim.jpg, banyan.jpg, bee.jpg, beehive.jpg, bell.jpg, big-ben.jpg, blue-whale.jpg, burj-khalifa.jpg, cactus.jpg, camel.jpg, cheetah.jpg, chichen-itza.jpg, chilika.jpg, christ-redeemer.jpg, colosseum.jpg, computer-parts.png, cv-raman.jpg, cygnets.jpg, dolphin.jpg, donkey.jpg, edison.jpg, eiffel.jpg, elephant-herd.jpg, emblem-india.png, everest.jpg, falcon.jpg, fawn.jpg, fish-school.jpg, flag-india.png, foal.jpg, fox.jpg, frog.jpg, gandhi.jpg, gir-lion.jpg, giraffe.jpg, greatwall.jpg, gukesh.jpg, harmanpreet.jpg, hawa-mahal.jpg, hirakud.jpg, howrah-bridge.jpg, jagannath.jpg, kalam.jpg, kangaroo.jpg, kathakali.jpg, konark-wheel.jpg, konark.jpg, liberty.jpg, lotus.jpg, machu-picchu.jpg, majhi.jpg, mango.jpg, mangrove.jpg, moon-aldrin.jpg, murmu.jpg, nest.jpg, odissi.jpg, olympic-rings.png, ostrich.jpg, owl.jpg, pattachitra.jpg, peacock.jpg, petra.jpg, pisa.jpg, pitcher-plant.jpg, pyramids.jpg, rafflesia.jpg, rathyatra.jpg, rhino.jpg, rsp.jpg, sahara.jpg, sarnath.jpg, sheep-flock.jpg, shubhanshu.jpg, simlipal.jpg, snail.jpg, solar-system.png, spider-web.jpg, statue-unity.jpg, sydney-opera.jpg, tagore.jpg, taj.jpg, tiger.jpg, world-continents.png, wright-flight.jpg
All from Wikimedia Commons (free licences). Files: aag.jpg, aakash.jpg, angoor.jpg, baagh.jpg, badal.jpg, bail.jpg, barf.jpg, cake.jpg, chand.jpg, cheenti.jpg, diya.jpg, doodh.jpg, gaay.jpg, gandhi.jpg, gaon.jpg, ghoda.jpg, hans.jpg, hansna.jpg, hathi.jpg, kamal.jpg, kitab.jpg, lalqila.jpg, machhli.jpg, mor.jpg, morni.jpg, nadi.jpg, pakshi.jpg, parvat.jpg, patang.jpg, ped.jpg, pustakalay.jpg, q-aankh.svg, q-baat.svg, q-chane.svg, q-din-raat.svg, q-eid.svg, q-kaan.svg, q-patra.svg, q-traffic.svg, ramsita.jpg, rourkela.jpg, samudra.jpg, sansad.jpg, shankh.jpg, sher.jpg, sherni.jpg, surya.jpg, suryast.jpg, suryoday.jpg, tajmahal.jpg, tiranga.jpg, tota.jpg, ullu.jpg, varsha.jpg, vidyalay.jpg
All from Wikimedia Commons (free licences). Files: conch.jpg, glass.jpg, globe.jpg, kite.jpg, moon.jpg, mountain.jpg, snake.jpg, statue.jpg, tiger.jpg