Title text:
Another group of mathematicians is working to put an upper bound on the number, although everyone keeps begging them to stop.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3137/
The number that makes people go insane is bigger than 2.6*10^21^, or 2,600,000,000,000,000,000,000