http://www.bbc.co.uk/schools/gcsebitesize/history/shp/modern/twentiethcenturycivilisationrev1.shtml

http://www.bbc.co.uk/schools/gcsebitesize/history/shp/modern/twentiethcenturycivilisationrev1.shtml

http://www.bbc.co.uk/schools/gcsebitesize/history/shp/modern/

http://www.sciencemuseum.org.uk/broughttolife/themes/technologies.aspx

http://www.helium.com/items/879540-the-most-famous-medical-advances-of-the-20th-century

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