sick of studying?

• 3blue1brown
• what if?
• Famous unsolved codes and ciphers – You could be the first!
• Quanta Magazine
• Dictionary of Numbers
• Paper Enigmas: Pringles Can, Wallet-ring, another tube
• Buy Secret Decoder Rings
• xkcd
• miscellaneous fun cryptography things
• Chalkdust
• Numberphile