Colin the Mathmo on Nostr: npub1xt7wm…0aztg I'm a grumpy old grey beard ...npub1xt7wmvtpswlza54mku4a04xtwdrw9xx4p48cppn4d4nrt9w2xzasg0aztg (npub1xt7…aztg) I'm a grumpy old grey beard ...