Hobby, I guess. E.g. here is a rather lively talk about it: http://lists.newtontalk.net/pipermail/newtontalk/2020-March/ http://lists.newtontalk.net/pipermail/n

Hobby, I guess. E.g. here is a rather lively talk about it: http://lists.newtontalk.net/pipermail/newtontalk/2020-March/ http://lists.newtontalk.net/pipermail/newtontalk/2020-March/