免疫学

免 = ⺈ + 口 + 儿 : Mnemonic symbol: 免责说明, a disclaimer.

Marilyn Monroe and the crane are on a date in the anthill. Sun Wukong served them cocktails in two mandarins, but the cocktails are so terrible that Marilyn and the crane had to puke all over the place which ruined their date. They want to sue sun Wukong, but he just shows them the place's disclaimer telling them that he is exempted from any responsibility.

疫 = 殳 + 疒 : Maud Younger (y) was supposed to fight an epidemic (疫) in the space station's bathroom (Ø4), but all she got was a halberd (殳). Very soon she got a colorful rash (疒) herself, but she still stands guard in the bathroom and forces everyone to wash their hands regularly.

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.