...when you give +1 to that post.
...when you use the PROT and NEUT elements in TPT to make an accurate model of an atomic nucleus, for every single element on the periodic table.
...When you sleep on the wrong side of the bed.
...When you start believing that the subatomic particle known as a proton has only 1 up quark and 2 down quarks. Ha!
...yes
...you think you are Napoleon
...when, after 5 years, you're still interested by TPT.