Sometimes a lot of excess notifications might appear on your Mac (often effectively the same one hundreds of times). Closing them one at a time can take a long time; sometimes they seem to go on forever. A restart usually fixes this, but you can also fix it with one simple terminal command...
Run the "Terminal" app (it is in the "Utilities" folder, in the "Applications" folder). Type: "killall NotificationCenter" (without the quotes). The notifications should disappear. Quit from Terminal.
The process starts itself again quickly, so real notifications should start appearing.
My latest blog post: Deontology vs Consequentialism: If we have free speech, personal freedom, equality, and truthfulness we are off to a pretty good start. (posted 2025-10-20). Warning: mysqli_connect(): MySQL server has gone away in /Library/WebServer/Documents/Owen2/Inc/Footer.m.inc.php on line 51
Warning: mysqli_connect(): Error while reading greeting packet. PID=89828 in /Library/WebServer/Documents/Owen2/Inc/Footer.m.inc.php on line 51
Warning: mysqli_connect(): (HY000/2006): MySQL server has gone away in /Library/WebServer/Documents/Owen2/Inc/Footer.m.inc.php on line 51
Warning: mysqli_error() expects parameter 1 to be mysqli, boolean given in /Library/WebServer/Documents/Owen2/Inc/Footer.m.inc.php on line 52
Could not connect to MySQL: