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# Image, Data and Problem Credits

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## Images

1. Close-up of the Prague astronomical clock by Fabrizio Verrecchia, from Unsplash, public domain.
2. Portrait of Isaac Newton by Godfrey Kneller, painted in 1689. Picture is a faithful reproduction of a two dimensional public domain work, retrieved from Wikimedia commons.
3. Drawing by Robert Hooke of the cell structure of cork from two different angles, as published in his 1665 book Micrographia. Picture is a faithful reproduction of a two dimensional public domain work,retrieved from Wikimedia commons.
4. Portrait of Galileo Galilei by Justus Sustermans, painted in 1636, currently located at the National Maritime Museum in London, UK. Picture is a faithful reproduction of a two dimensional public domain work, retrieved from Wikimedia commons.
5. Portrait of Charles de Coulomb. Picture is a faithful reproduction of a two dimensional public domain work, retrieved from Wikimedia commons.
6. Images by Michael Maggs, Wikimedia commons, falling ball and Wikimedia commons, bouncing ball, CC BY-SA 3.0.
7. Image by Amber Turner, Unsplash, public domain.
8. Image by GSenkow, Wikimedia commons, CC BY-SA 3.0.
9. Image cropped from fruit stand image by Redd Angelo, Unsplash, public domain.
10. Image by Malene Thyssen, Wikimedia commons, CC BY-SA 3.0.
11. Image of Allyson Felix at the 2012 Summer Olympics by Citizen59, Wikimedia commons, CC BY-SA 3.0.
12. Image of Robert Garrett throwing the discus at the 1896 Summer Olympics; picture by Albert Meyer, shared by the Bulgarian Archives State Agency (file BASA-3K-7-422-22) through Wikimedia commons, public domain.
13. Photograph of Emmy Noether, unknown date and photographer, obtained from Wikimedia commons, public domain.
14. Photograph of Konstantin Eduardovich Tsiolkovsky, unknown date and photographer, obtained from Wikimedia commons, public domain.
15. Images from NASA, public domain.
16. Image by Securiger, Wikimedia commons, CC BY-SA 3.0.
17. Image by Jayess, Wikimedia commons, public domain.
18. Image by Markmcgee, Wikimedia commons, public domain.
19. Image by Arnaud 25, Wikimedia commons, public domain.
20. Image from NASA’s Aqua/MODIS satellite, retreived from Wikimedia commons, public domain.
21. Portrait of Johannes Kepler by an unknown artist, 1610. Picture is a faithful reproduction of a two dimensional public domain work, retrieved from Wikimedia commons.
22. Portrait of Leonhard Euler by Jakob Emanuel Handmann, 1753. Picture is a faithful reproduction of a two dimensional public domain work (now in the Kunstmuseum Basel), retrieved from Wikimedia commons.
23. Portrait of Christiaan Huygens by Caspar Netscher, painted in 1671, currently located at museum Boerhave in Leiden, The Netherlands. Picture is a faithful reproduction of a two dimensional public domain work, retrieved from Wikimedia commons.
24. Photograph of Christian Doppler, unknown date and photographer, obtained from Wikimedia commons, public domain.
25. Mach’s 1888 photograph of the shockwaves created by a supersonic brass bullet. This photo was taken in Prague, using Schlieren Photography on a 5 mm-diameter negative. Obtained from Wikimedia commons, public domain.
26. Photograph of Ernst Mach from the Zeitschrift für Physikalische Chemie, Band 40, 1902, obtained from Wikimedia commons, public domain.
27. Official 1921 Nobel prize photograph of Albert Einstein, obtained from Nobelprize.org, public domain.
28. Photograph of Lorentz from the collection of Museum Boerhaave, Leiden, The Netherlands, obtained from Wikimedia commons, public domain.
29. Photograph of Minkowski from the book Raum und Zeit (Jahresberichte der Deutschen Mathematiker Vereinigung, Leipzig, 1909), obtained from Wikimedia commons, public domain.
30. Screen shots from buienradar.nl, taken on October 28, 2013.

## Data

1. Data from NASA planetary fact sheets at https://nssdc.gsfc.nasa.gov/planetary/planetfact.html.

## Problems

1. Problem inspired by problem 4-s1 from ‘Problems in introductory physics’ by Crowell and Shotwell, available on Light and matter, CC BY-SA 3.0.