科教兴国

科 = 斗 + 禾 : In front of the elevator, Karl Marx wants to conduct one of his science experiments. He wants to condition the matador to only eat cereals until the end of his life.

教 = 孝 + 攵 : Joan of Arc joined an apocalyptic religious sect that taught her to dig her own grave. Wearing a mourning veil, she breaks the floor of the aorta's bathroom open using a sledgehammer.

兴 = ⺍ + 一 + 八 : Mnemonic symbol from the shape of the character: a sea star. Xi shi (xi) and a sea star (⺍) have a strong desire (兴) to smoke catnip (⺍) through a flute (一), so they hide in the engine's bathroom ((e)ng4) to crush the catnip with an eight-ball (八) and smoke it. Shortly afterwards they relax and loose all their excitement (兴) and interest in anything (兴).

国 = 囗 + 玉 : Mnemonic symbol: a nation's flag. Let's say the Chinese flag.

In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.