I think congratulations are due to Arturo Magidin on hitting 100k reputation points here on MSE! All the users of this site are better off for his tireless contributions, and we appreciate his positive influence on mathematics and mathematics education via this site.
Thank you kindly, one and all. Now, if I can only get as much done in my research...
Indeed, kudos! You're actually the first user on the entire network to reach this 100k threshold outside of Stack Overflow -- which is 333x larger by my current (poor) math calculations. Yes, even before the older and larger sites like Super User and Server Fault, etc.
I also announced this on Twitter to ~62k followers. Congrats!