What's the next number?

Video File: 
Subject: 
Category: 
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Lecture Series / Conference / Course : 
Youtube-url: 
https://youtu.be/S0sbOENFSZw
Start Time: 
11:30
End Time: 
12:30
Additional Specific Requirement: 
Still Photo
Group Photo
Others
Date: 
Saturday, September 15, 2018
Short Title: 
What's the next number?