Been there, done that. But there's always time for new challenges.
Currently trying to relearn C++(11) after some years in an isolation bubble in which all interesting C++ features were forbidden. Turns out the language is Not So Bad After All. Although I haven't yet decided whether it's Good Enough to be Worth Criticizing.
The best algorithm is one whose beauty makes you gasp for breath. My lifelong ambition is to have one of those named after me; meanwhile, I collect other people's.
Q&A for professional and enthusiast programmers
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for computer enthusiasts and power users
Q&A for students, researchers and practitioners of computer science
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for peer programmer code reviews
Q&A for people studying math at any level and professionals in related fields
Q&A for linguists, etymologists, and serious English language enthusiasts
Q&A for professional system and network administrators
Q&A for theoretical computer scientists and researchers in related fields