Interesting tool: Shared PDF annotations

[Craig Stuntz]

This tool allows collaborative annotations of PDFs:

https://via.hypothes.is/https://www.cs.cmu.edu/~rwh/plbook/2nded.pdf

I haven't used it before, so I'm not sure if there are red flags I'm unaware of, but it might be a nice way for people to bring up discussion topics as we read?

[Cyrus Omar]

I agree that this seems useful, but we need a stable PDF for this purpose -- I'm guessing annotations are lost if Bob updates the file on the server, which he often does.

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[Ilan Godik]

If stability is a problem, we can use it via IPFS (addressed by the content's hash), which makes the content and address immutable:  https://gateway.ipfs.io/ipfs/QmfSLyC2wnHePbdM6xgv7cFxNBDdfEuDxXAWygKpdAXZtz/Practical%20Foundations%20for%20Programming%20Languages%20%28Second%20Edition%29.pdf

(Please pin the hash 'QmXuCPrNmAHX69M36fU6xx1dQRoPNXtCC5RafxQtb4WcAr' to keep it alive on the internet)