A directory of useful objects found on the web for teaching Maths.
http://ed.ted.com/lessons/can-you-solve-the-control-room-riddle-dennis-shasha (Alternate link)
Activity, Problem, Puzzle, Publisher, TEDEd, Video, YouTube
As your country's top spy, you must infiltrate the headquarters of the evil syndicate, find the secret control panel, and deactivate their death ray. But your reconnaissance team is spotty, and you have only limited information about the control panel's whereabouts. Can you solve the control room riddle and deactivate their weapon in time? Dennis Shasha shows you how.
10 June 2016 Edit: 5 June 2016
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