Although most of mine have been said, I'd like to add 2 more to the list.
1. I learned some Linear B and Egyptian hieroglyphs: not only the symbols, but the languages behind them too (Ancient Greek and Ancient Coptic respectively).
2. While my online banking uses 1024 bit RSA encryption, I use 3072 bit DH/DSS encryption. I have encrypted "hello" below in my public key (If anybody can derive my private key from that I'll give them a nickel
).
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