World History tools.
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Website: http://gnowledge.com/
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Paid iPhone app: https://itunes.apple.com/us/app/timeline-eons/id429829445?mt=8&uo=4&at=10l6SU
Website: http://www.howstuffworks.com/
Free Android Phone app: https://play.google.com/store/apps/details?id=com.twentythreedivide.hsw
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Free iPad app: https://itunes.apple.com/us/app/howstuffworks/id401986544?mt=8&at=10l6SU
Website: https://www.historypin.org/
Free Android Phone app: https://play.google.com/store/apps/details?id=com.historypin.Historypin
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Website: http://www.mnh.si.edu/panoramas/