Matrix exists and really isn't too bad to self-host if you just want a small number of people. (If you federate with other servers, then you have more things to worry about -- increased attack surface, more visibility leading to more potential attackers, and the risk of unintentionally storing illegal content (e.g. CSAM) sent by people from other servers.)
The UI of Element (the most popular Matrix client) is more or less in line with any other chat app, but I guess it depends what you mean by "on par to whatsapp". Biggest downside I've found is that you can't search your messages on the mobile clients.
Altough I’m not an economist, it seems that the events shown in the graph coincide with the suspension of dollar - gold convertibility until then regulated by Bretton Woods monetary system
Sorry for my late reply. Touretzky's Common Lisp: A Gentle Introduction to Symbolic Computation holds up well as a good introduction. Steve Losh's A Road to Common Lisp is a great roadmap for going further (https://stevelosh.com/blog/2018/08/a-road-to-common-lisp/).
For tooling, you can get started with just sbcl and rlwrap, both of which should be in any Linux repo. Get a REPL with `rlwrap sbcl`. Exit with `(exit)`.
Yes the explanation is diffraction. As light passes through a lens, diffraction acts in similar way as a light through a small pinhole. Incidentally, pinholes and apertures are low pass filters.
Some more info here
Miles V. Klein, Thomas E. Furtak - Optics 2nd ed, Wiley
Joseph W. Goodman - Introduction to Fourier optics, W.H. Freeman
I totally agree with your comment. I should add that, as the Romans used to say quite some time ago, 'Audentes fortuna juvat' (fortune favors the bold). With this I mean to say that some more optimistic and unmindful attitude usually helps in finding those doors, or at least in forgetting the ones that did not eventually open.
Hmm, I’m curious what you mean by unmindful. I feel that a mindful (as in meditation mindfulness) and grounding oneself in the present would _help_ find doors, rather than being unmindful (I.e. wrapped up in future or past thinking)
well, I meant unmindful as in trying to forget that to get to the point where you stand today you had to pass past some doors that you decided not to open. A child-like attitude towards discovery, free from preconceptions. Then, after discovery, we should ground ourselves and leverage from our adult experience. My own experience with great thinkers I knew (some Nobel-prize level) is that we need to go from moments of imagination to moments of reality check many times. Kind of the same line as Feynman’s experience
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