ANN: Leo 6.2 b1 released

Leo 6.2-b1, http://leoeditor.com, is now available on [GitHub]( https://github.com/leo-editor/leo-editor). Leo is an [IDE, outliner and PIM](http://leoeditor.com/preface.html). **The highlights of Leo 6.2** - Added the fstringify-files and diff-fstringify-files commands. - Improved the beautify-

A simple probabilistic model for COVID-19

Hi! I've created a Jupyter notebook that presents a simple probabilistic model linking diseases (cold, flu, COVID-19) to symptoms (fever, cough): http://mybinder.org/v2/gh/piedenis/lea_mini_tutorials/master?filepath=Lea_CO VID19.ipynb Assuming that this model is accurate (which is probably not!)