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What if every slide in a talk had a QR code to interact with?
In theory scanning a QR code is just the same as typing a URL, but it can be faster (esp for long URLs) and is big in China.

Maybe we could develop new forms of coordinated audience interaction. Both in the auditorium and later online.
Here's @conniechan on QR codes in China in 2017:

And @avesegal with the 2019 version:

Crypto may mainstream QR codes in the West.
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