密码学

密 = 宀 + 必 + 山 : Marilyn Monroe (mi) is secretly (密) making out with her secretary (密) Khubilai Khan (必). Because it has to be a secret (密), they meet in the space station's bathroom (Ø4) and hide under a huge graduation cap (宀). Just to be sure Khubilai Khan has two forks (山) in his hands to attack anyone who might enter and see them.

码 = 石 + 马 : Just when Mahatma Gandhi (m) and the unicorn (马) entered the ashram (a3) a giant rock (石) fell down and trapped them inside. There is an inscription written on it: if they ever want to leave, they will have to find the secret number (码) and say it out loud. There is also a hint: "how many roads must a man walk down?"

学 = 小 + 冖 + 子 : Xu Xian wants to study scienceology and learn more about daisies. Just inside the elevator's kitchen, he put some daisies into a prize cup and covered them with a cooking top. He wants to study the growth rate of the daisies depending on the pH of the water in the prize cup.