Cheat codes versus public education

Video game codes I remember without even trying:

• 30 lives in Contra: Up Up Down Down Left Right Left Right B A
• Face Mike Tyson in Mike Tyson's Punch Out: 007-373-5963
• Warp to Dr. Wiley's castle in Mega Man 2: A1 B2 B4 C1 C5 D1 D3 E3 E5
• Play Metroid without Samus's suit: JUSTIN BAILEY
• Jump to the second quest in The Legend of Zelda: ZELDA
  
• Activate blood in Mortal Kombat (Sega Genesis): A B A C A B B
• Invincibility in Doom: IDDQD
• Acquire all weapons and keys in Doom: IDKFA
  

Things I remember from high school chemistry class:

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