The 28-year-old previously said he created the event in response to the rising cost of festival and gig tickets.
Around 200 of these hands are in use, mostly by researchers at universities and tech firms.
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14:09: Shreeyam - the youngest victim of the shootings that day - is seen peacefully walking away from the front line, where other protesters are pelting police with stones. Still carrying his school bag, he claps his hands - a gesture that appears calm.
be integrated with various apps and platforms such as Microsoft Office,