惰性气体

惰 = 忄 + 左 + 月 : Doggy Dog (du) is very lazy (惰) and slacking off sleeping on the moon (月) in the observatory's bathroom (o4), but in the end the communist (左) finds him and punishes him with a flail (忄) for being so lazy (惰).

性 = 忄 + 生 : Marie Curie had a strong character since she was little. Even in her cradle in the engine's bathroom she was only playing with a flail.

Mnemonic symbol: a balloon. The Queen of Hearts is disappointed by her balloons. She expected them to float upwards, but in the space station's bathroom, They float randomly in all directions.

体 = 亻 + 本 : Rosa Luxemburg envies Mother Teresa's hot body. She asks her how she can be such a hottie even when lifting is not possible, like in the space station's zero gravity, and Mother Teresa answers that it's because of the roots she's eating.