Study & Credits — Sources, Licensing & Attribution

Why this page exists. Educators, parents, and students should always be able to trace the source of a fact, image, or 3D model. Every learning card in our initiatives links back to its origin — Wikipedia, Wikidata, the holding museum, or the original Sketchfab creator — with a license and a note on how to verify it.

Wikipedia is a great starting point. Peer-reviewed studies (e.g. Nature, 2005) found its accuracy comparable to traditional encyclopedias, and it updates faster. To verify a claim, scroll to References, cross-check linked museum records and Wikidata, and read the Talk and View history tabs for contested content.

In-copyright works (e.g. Picasso, Basquiat, Lawrence, Kahlo, Hopper, Wood, O'Keeffe) are shown under fair use for educational study and commentary, with clear attribution to the rights holder.

Art History

The Starry Night

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/The_Starry_Night

CC BY-SA 4.0

Art History

The Starry Night

Museum record — Museum of Modern Art (MoMA), New York

Museum of Modern Art (MoMA), New York

https://www.moma.org/collection/works/79802

Museum Open Access (often CC0)

Art History

The Starry Night

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Van_Gogh_-_Starry_Night_-_Google_Art_Project.jpg/1280px-Van_Gogh_-_Starry_Night_-_Google_Art_Project.jpg

Public domain / Wikimedia Commons

Art History

The Great Wave off Kanagawa

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/The_Great_Wave_off_Kanagawa

CC BY-SA 4.0

Art History

The Great Wave off Kanagawa

Museum record — The Metropolitan Museum of Art, New York

The Metropolitan Museum of Art, New York

https://www.metmuseum.org/art/collection/search/45434

Museum Open Access (often CC0)

Art History

The Great Wave off Kanagawa

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Tsunami_by_hokusai_19th_century.jpg/1280px-Tsunami_by_hokusai_19th_century.jpg

Public domain / Wikimedia Commons

Art History

Mona Lisa

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Mona_Lisa

CC BY-SA 4.0

Art History

Mona Lisa

Museum record — Musée du Louvre, Paris

Musée du Louvre, Paris

https://collections.louvre.fr/en/ark:/53355/cl010062370

Museum Open Access (often CC0)

Art History

Mona Lisa

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_retouched.jpg/800px-Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_retouched.jpg

Public domain / Wikimedia Commons

Art History

Girl with a Pearl Earring

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Girl_with_a_Pearl_Earring

CC BY-SA 4.0

Art History

Girl with a Pearl Earring

Museum record — Mauritshuis, The Hague

Mauritshuis, The Hague

https://www.mauritshuis.nl/en/our-collection/artworks/670-girl-with-a-pearl-earring/

Museum Open Access (often CC0)

Art History

Girl with a Pearl Earring

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/0/0f/1665_Girl_with_a_Pearl_Earring.jpg/800px-1665_Girl_with_a_Pearl_Earring.jpg

Public domain / Wikimedia Commons

Art History

Guernica

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Guernica

CC BY-SA 4.0

Art History

Guernica

Museum record — Museo Reina Sofía, Madrid

Museo Reina Sofía, Madrid

https://www.museoreinasofia.es/en/collection/artwork/guernica

Museum terms (educational use)

Art History

Guernica

Reference image

In-copyright; shown under fair use for educational study.

https://upload.wikimedia.org/wikipedia/en/thumb/7/74/PicassoGuernica.jpg/1280px-PicassoGuernica.jpg

Fair use — © Estate of Pablo Picasso (image for educational use)

Art History

The Scream

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/The_Scream

CC BY-SA 4.0

Art History

The Scream

Museum record — Nasjonalmuseet, Oslo

Nasjonalmuseet, Oslo

https://www.nasjonalmuseet.no/en/collection/object/NG.M.00939

Museum Open Access (often CC0)

Art History

The Scream

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Edvard_Munch%2C_1893%2C_The_Scream%2C_oil%2C_tempera_and_pastel_on_cardboard%2C_91_x_73_cm%2C_National_Gallery_of_Norway.jpg/800px-Edvard_Munch%2C_1893%2C_The_Scream%2C_oil%2C_tempera_and_pastel_on_cardboard%2C_91_x_73_cm%2C_National_Gallery_of_Norway.jpg

Public domain / Wikimedia Commons

Art History

The Birth of Venus

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/The_Birth_of_Venus

CC BY-SA 4.0

Art History

The Birth of Venus

Museum record — Uffizi Gallery, Florence

Uffizi Gallery, Florence

https://www.uffizi.it/en/artworks/birth-of-venus

Museum Open Access (often CC0)

Art History

The Birth of Venus

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Sandro_Botticelli_-_La_nascita_di_Venere_-_Google_Art_Project_-_edited.jpg/1280px-Sandro_Botticelli_-_La_nascita_di_Venere_-_Google_Art_Project_-_edited.jpg

Public domain / Wikimedia Commons

Art History

Travelers Among Mountains and Streams

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Travelers_Among_Mountains_and_Streams

CC BY-SA 4.0

Art History

Travelers Among Mountains and Streams

Museum record — National Palace Museum, Taipei

National Palace Museum, Taipei

https://theme.npm.edu.tw/khan/Article.aspx?sNo=03001783

Museum Open Access (often CC0)

Art History

Travelers Among Mountains and Streams

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Fan_Kuan_-_Travelers_Among_Mountains_and_Streams_-_Google_Art_Project.jpg/520px-Fan_Kuan_-_Travelers_Among_Mountains_and_Streams_-_Google_Art_Project.jpg

Public domain / Wikimedia Commons

Art History

Benin Bronze Plaque (Warrior with Attendants)

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Benin_Bronze_Plaque_(Warrior_with_Attendants)

CC BY-SA 4.0

Art History

Benin Bronze Plaque (Warrior with Attendants)

Museum record — British Museum, London (with active restitution discussions)

British Museum, London (with active restitution discussions)

https://www.britishmuseum.org/collection/term/x21442

Museum Open Access (often CC0)

Art History

Benin Bronze Plaque (Warrior with Attendants)

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/Benin_brass_plaque_03.jpg/800px-Benin_brass_plaque_03.jpg

Photo CC BY-SA / Wikimedia Commons

Art History

Padshahnama: Shah-Jahan Receives His Sons

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Padshahnama%3A_Shah-Jahan_Receives_His_Sons

CC BY-SA 4.0

Art History

Padshahnama: Shah-Jahan Receives His Sons

Museum record — Royal Collection Trust, Windsor

Royal Collection Trust, Windsor

https://www.rct.uk/collection/1005025

Museum Open Access (often CC0)

Art History

Padshahnama: Shah-Jahan Receives His Sons

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Bichitr._Padshahnama_plate_10._Shah-Jahan_receives_his_sons.jpg/1024px-Bichitr._Padshahnama_plate_10._Shah-Jahan_receives_his_sons.jpg

Public domain / Wikimedia Commons

Art History

Self-Portrait with Thorn Necklace and Hummingbird

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Self-Portrait_with_Thorn_Necklace_and_Hummingbird

CC BY-SA 4.0

Art History

Self-Portrait with Thorn Necklace and Hummingbird

Museum record — Harry Ransom Center, University of Texas at Austin

Harry Ransom Center, University of Texas at Austin

https://www.hrc.utexas.edu/multimedia/?doc_id=18&action=collection&collection_id=20

Museum terms (educational use)

Art History

Self-Portrait with Thorn Necklace and Hummingbird

Reference image

In-copyright; shown under fair use for educational study.

https://upload.wikimedia.org/wikipedia/en/thumb/1/16/Frida_Kahlo_%28self_portrait%29.jpg/600px-Frida_Kahlo_%28self_portrait%29.jpg

Fair use — for educational reference

Art History

Nighthawks

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Nighthawks

CC BY-SA 4.0

Art History

Nighthawks

Museum record — Art Institute of Chicago

Art Institute of Chicago

https://www.artic.edu/artworks/111628/nighthawks

Museum terms (educational use)

Art History

Nighthawks

Reference image

In-copyright; shown under fair use for educational study.

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Nighthawks_by_Edward_Hopper_1942.jpg/1280px-Nighthawks_by_Edward_Hopper_1942.jpg

Fair use — for educational reference

Art History

American Gothic

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/American_Gothic

CC BY-SA 4.0

Art History

American Gothic

Museum record — Art Institute of Chicago

Art Institute of Chicago

https://www.artic.edu/artworks/6565/american-gothic

Museum terms (educational use)

Art History

American Gothic

Reference image

In-copyright; shown under fair use for educational study.

https://upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Grant_Wood_-_American_Gothic_-_Google_Art_Project.jpg/800px-Grant_Wood_-_American_Gothic_-_Google_Art_Project.jpg

Fair use — for educational reference

Art History

Untitled (Skull)

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Untitled_(Skull)

CC BY-SA 4.0

Art History

Untitled (Skull)

Museum record — The Broad, Los Angeles

The Broad, Los Angeles

https://www.thebroad.org/art/jean-michel-basquiat

Museum terms (educational use)

Art History

Untitled (Skull)

Reference image

In-copyright; shown under fair use for educational study.

https://upload.wikimedia.org/wikipedia/en/thumb/3/3e/Untitled_acrylic_and_mixed_media_on_canvas_by_-Jean-Michel_Basquiat%2C_1984.jpg/600px-Untitled_acrylic_and_mixed_media_on_canvas_by_-Jean-Michel_Basquiat%2C_1984.jpg

Fair use — © Estate of Jean-Michel Basquiat (educational reference)

Art History

Cow's Skull: Red, White, and Blue

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/Cow's_Skull%3A_Red%2C_White%2C_and_Blue

CC BY-SA 4.0

Art History

Cow's Skull: Red, White, and Blue

Museum record — The Metropolitan Museum of Art, New York

The Metropolitan Museum of Art, New York

https://www.metmuseum.org/art/collection/search/488694

Museum terms (educational use)

Art History

Cow's Skull: Red, White, and Blue

Reference image

In-copyright; shown under fair use for educational study.

https://upload.wikimedia.org/wikipedia/en/thumb/a/aa/Cow%27s_Skull-_Red%2C_White%2C_and_Blue.jpg/600px-Cow%27s_Skull-_Red%2C_White%2C_and_Blue.jpg

Fair use — for educational reference

Art History

The Migration Series, Panel 1

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/The_Migration_Series%2C_Panel_1

CC BY-SA 4.0

Art History

The Migration Series, Panel 1

Museum record — The Museum of Modern Art / The Phillips Collection (split set)

The Museum of Modern Art / The Phillips Collection (split set)

https://www.moma.org/collection/works/79352

Museum terms (educational use)

Art History

The Migration Series, Panel 1

Reference image

In-copyright; shown under fair use for educational study.

https://upload.wikimedia.org/wikipedia/en/thumb/5/57/Migration_Series_Panel_1.jpg/800px-Migration_Series_Panel_1.jpg

Fair use — © Jacob and Gwendolyn Knight Lawrence Foundation

Art History

The Kiss

Wikipedia article

Encyclopedia entry — fact-check against References section.

https://en.wikipedia.org/wiki/The_Kiss

CC BY-SA 4.0

Art History

The Kiss

Museum record — Belvedere, Vienna

Belvedere, Vienna

https://www.belvedere.at/en/kiss

Museum Open Access (often CC0)

Art History

The Kiss

Reference image

Public domain reproduction.

https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/The_Kiss_-_Gustav_Klimt_-_Google_Cultural_Institute.jpg/800px-The_Kiss_-_Gustav_Klimt_-_Google_Cultural_Institute.jpg

Public domain / Wikimedia Commons

Virtual Archaeology

Pompeii

Wikipedia article

Roman — Roman, buried 79 CE

https://en.wikipedia.org/wiki/Pompeii

CC BY-SA 4.0

Virtual Archaeology

Pompeii

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/4a2c3eaa9f4f4f3e9e0d7fa0fc8e7f8f

Sketchfab community / CC BY

Virtual Archaeology

Göbekli Tepe

Wikipedia article

Pre-Pottery Neolithic foragers — Pre-Pottery Neolithic, c. 9500 BCE

https://en.wikipedia.org/wiki/G%C3%B6bekli_Tepe

CC BY-SA 4.0

Virtual Archaeology

Göbekli Tepe

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/8d1c1ff04c5d4f95b0f80d2bb1fdc6cc

Sketchfab community / CC BY

Virtual Archaeology

Machu Picchu

Wikipedia article

Inca — Inca, c. 1450 CE

https://en.wikipedia.org/wiki/Machu_Picchu

CC BY-SA 4.0

Virtual Archaeology

Machu Picchu

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/9b30d0c2f6d4435c9a6bbf6c4afa2d77

Sketchfab community / CC BY

Virtual Archaeology

Giza Pyramid Complex

Wikipedia article

Ancient Egyptian — Old Kingdom, c. 2580–2510 BCE

https://en.wikipedia.org/wiki/Giza_pyramid_complex

CC BY-SA 4.0

Virtual Archaeology

Giza Pyramid Complex

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/8ff7af6f2aae4c659b98da3cd1e5a8f0

Sketchfab community / CC BY

Virtual Archaeology

Stonehenge

Wikipedia article

Neolithic / Bronze Age Britons — Neolithic & Bronze Age, c. 3000–1600 BCE

https://en.wikipedia.org/wiki/Stonehenge

CC BY-SA 4.0

Virtual Archaeology

Stonehenge

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/3a5f0b3e6c2d4a1ba0dda2f63aabbf29

Sketchfab community / CC BY

Virtual Archaeology

Teotihuacán

Wikipedia article

Teotihuacano — Mesoamerican, c. 100 BCE – 550 CE

https://en.wikipedia.org/wiki/Teotihuacan

CC BY-SA 4.0

Virtual Archaeology

Teotihuacán

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/7d2a59ab2a1a4f2b8e78b5b3e4f1a1c2

Sketchfab community / CC BY

Virtual Archaeology

Petra

Wikipedia article

Nabataean — Nabataean, c. 4th c. BCE – 2nd c. CE

https://en.wikipedia.org/wiki/Petra

CC BY-SA 4.0

Virtual Archaeology

Petra

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/2b6c2c7b2c4f4d4f9b5a4d2e1f8e7d6c

Sketchfab community / CC BY

Virtual Archaeology

Angkor Wat

Wikipedia article

Khmer Empire — Khmer, early 12th century CE

https://en.wikipedia.org/wiki/Angkor_Wat

CC BY-SA 4.0

Virtual Archaeology

Angkor Wat

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/5e3e3a52b1d24a2492e0c3a73d54f0e1

Sketchfab community / CC BY

Virtual Archaeology

Chichén Itzá

Wikipedia article

Maya / Toltec — Maya / Toltec, c. 600–1200 CE

https://en.wikipedia.org/wiki/Chichen_Itza

CC BY-SA 4.0

Virtual Archaeology

Chichén Itzá

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/6a4f9b9bcfc946ee9a8e7c66c64bfb6c

Sketchfab community / CC BY

Virtual Archaeology

Lascaux Cave

Wikipedia article

Magdalenian — Upper Paleolithic, c. 17,000 BCE

https://en.wikipedia.org/wiki/Lascaux

CC BY-SA 4.0

Virtual Archaeology

Lascaux Cave

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/d5b6e3d2f9c34b54a4f7c0c0f0a2bbe7

Sketchfab community / CC BY

Virtual Archaeology

Terracotta Army

Wikipedia article

Qin Chinese — Qin Dynasty, c. 210 BCE

https://en.wikipedia.org/wiki/Terracotta_Army

CC BY-SA 4.0

Virtual Archaeology

Terracotta Army

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/6e0c1c5b4d9b4f3a8d8b9c6a5b4e3f2d

Sketchfab community / CC BY

Virtual Archaeology

Mesa Verde Cliff Palace

Wikipedia article

Ancestral Pueblo — Ancestral Puebloan, c. 1190–1300 CE

https://en.wikipedia.org/wiki/Cliff_Palace

CC BY-SA 4.0

Virtual Archaeology

Mesa Verde Cliff Palace

3D model (Sketchfab embed)

Embedded for in-app study; credit to original creator.

https://sketchfab.com/models/2e7e7c9c3d2c4a5fa9b3a2e6f3a3a3c2

Sketchfab community / CC BY

Math History

Pythagoras

Wikipedia article

Ancient Greece — c. 570 – c. 495 BCE

https://en.wikipedia.org/wiki/Pythagoras

CC BY-SA 4.0

Math History

Euclid

Wikipedia article

Hellenistic Egypt — c. 300 BCE

https://en.wikipedia.org/wiki/Euclid

CC BY-SA 4.0

Math History

Archimedes

Wikipedia article

Magna Graecia — c. 287 – 212 BCE

https://en.wikipedia.org/wiki/Archimedes

CC BY-SA 4.0

Math History

Al-Khwārizmī

Wikipedia article

Abbasid Caliphate — c. 780 – c. 850

https://en.wikipedia.org/wiki/Al-Khwarizmi

CC BY-SA 4.0

Math History

Fibonacci (Leonardo of Pisa)

Wikipedia article

Medieval Italy — c. 1170 – c. 1250

https://en.wikipedia.org/wiki/Fibonacci

CC BY-SA 4.0

Math History

Isaac Newton

Wikipedia article

Scientific Revolution — 1643 – 1727

https://en.wikipedia.org/wiki/Isaac_Newton

CC BY-SA 4.0

Math History

Leonhard Euler

Wikipedia article

Enlightenment — 1707 – 1783

https://en.wikipedia.org/wiki/Leonhard_Euler

CC BY-SA 4.0

Math History

Carl Friedrich Gauss

Wikipedia article

19th-century Europe — 1777 – 1855

https://en.wikipedia.org/wiki/Carl_Friedrich_Gauss

CC BY-SA 4.0

Math History

Srinivasa Ramanujan

Wikipedia article

Modern India — 1887 – 1920

https://en.wikipedia.org/wiki/Srinivasa_Ramanujan

CC BY-SA 4.0

Math History

Emmy Noether

Wikipedia article

20th century — 1882 – 1935

https://en.wikipedia.org/wiki/Emmy_Noether

CC BY-SA 4.0

Math History

Alan Turing

Wikipedia article

20th century — 1912 – 1954

https://en.wikipedia.org/wiki/Alan_Turing

CC BY-SA 4.0

Math History

Maryam Mirzakhani

Wikipedia article

Contemporary — 1977 – 2017

https://en.wikipedia.org/wiki/Maryam_Mirzakhani

CC BY-SA 4.0

Whale Studies

Whale Studies (overview)

Wikipedia: Cetacea

Background on whales, dolphins, and porpoises.

https://en.wikipedia.org/wiki/Cetacea

CC BY-SA 4.0

Whale Studies

Whale Studies (overview)

Wikipedia: Whale vocalization

Whale song, communication, and language-evolution context.

https://en.wikipedia.org/wiki/Whale_vocalization

CC BY-SA 4.0

Whale Studies

Whale Studies (overview)

NOAA Fisheries — Whales

Species facts, migration, and conservation status.

https://www.fisheries.noaa.gov/whales

U.S. government work — public domain

Whale Studies

Whale Studies hero image

Project artwork (in-house)

Generated/owned by the project; not for redistribution.

/projects/whale-studies

Citizen Science

Species observations

iNaturalist research-grade observations

Joint initiative of California Academy of Sciences and National Geographic Society. GlobeOnline is not affiliated with or endorsed by iNaturalist.

https://www.inaturalist.org/

CC BY-NC 4.0 (per-observer license may vary)

Citizen Science

AI explanations

Lovable AI Gateway (LLM-generated text)

May contain inaccuracies; treat as a study aid, not a citation.

https://docs.lovable.dev/features/ai

Generated content — verify against primary sources