The most interesting presentation I saw during the last year. Everyone must see it
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Did you know 2014
https://www.youtube.com/watch?v=XrJjfDUzD7M
Did you know 2016
https://www.youtube.com/watch?v=uqZiIO0YI7Y&feature=youtu.be
Did yiu know 2017
https://www.youtube.com/watch?v=u06BXgWbGvA
Did you know 2028