R.I.P. John Conway, age 82, died from COVID-19 in my home state of New Jersey, April 11, 2020.
You can read about Conway on Wikipedia, but this Mathematician was extremely involved with mathematical games. I have been a big fan of his 'Game of Life', and I still have my 'Soma' cube puzzle. He worked with Guy and Berlekamp on the classic book 'Winning Ways for your Mathematical Plays'.
I saw some easy videos a few year's ago. I just checked again and it is the "Numberphile" educational youtube channel. (In my memory he was reacting to the 2048 game but that wasn't him.)
If any of you want to pay a tribute you can watch him explain how he was tired of having his name attached to the game of life and none of the work that was most important in his own (life I mean).
As a thinker about Collatz, I had read about fractran and it seemed quite complicated, when JH Conway lectures, it is so limpid and amazing, great lecture !