History of the Metric System

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Image attributions

Egyptian: https://openclipart.org/detail/222268/egyptian
Roman Centurion: https://openclipart.org/detail/231819/roman-centurion
Greek Woman: https://openclipart.org/detail/236751/female-mythological-figures
All images in public domain and fully licensed.

English sign: https://commons.wikimedia.org/wiki/File:Kimpton_-_Road_Sign_-_geograph.org.uk_-_1104107.jpg (Attrib. Chris Talbot)
Irish sign: https://commons.wikimedia.org/wiki/File:Road_Sign_on_the_N2_at_Primatestown,_Co._Meath_-_geograph.org.uk_-_1185333.jpg (Attrib. JP)

Metric measures: https://commons.wikimedia.org/wiki/File:FourMetricInstruments.JPG (Attrib. Martinvl)

Map:https://commons.wikimedia.org/wiki/File:Metric_system.png (Public Domain)
Pint: https://commons.wikimedia.org/wiki/File:Pint_of_Grolsch.jpg (Attrib. Strom Carlson)

Climate Orbiter: https://commons.wikimedia.org/wiki/File:Mars_Climate_Orbiter_2.jpg (NASA – Public Domain)