显生宙

显 = 业 + 日 : Marie Curie (xi) is dating the bullfrog (业) in the anthill (an3). There is a prominent (显) sun (日) floating over the bullfrog which Marie just cannot ignore, so she has to stare at the sun barely able to say anything for the whole evening.

生 = 牛 + 一 : Mnemonic symbol: a cradle.

Sherlock Holmes (sh) comforts a crying baby bull (牛) in a cradle (生) in front of the engine ((e)ng1) and plays him a tune on a flute (一).

宙 = 宀 + 由 : James II of England (zh) finds that he forgot his cuba libre (由) in the outhouse's bathroom (ou4) during the last party. A lot later he finds that in the glass a whole new universe (宙) has developed. He writes a thesis about it and earns a PhD, proudly wearing a graduation cap (宀).