小儿科

小 = 八 + 亅 : Mnemonic symbol: a small daisy. 小 looks like the stem 亅 of the flower is pushing aside the earth 八 as it grows out of the seed in the ground.

Xi Shi (xi) is decorating her hair with lots of small (小) daisies (mnemonic symbol for 小) in the aorta's living room (ao3). She wants to have lots of daisies in the future as well, so she plants new daisies. She found that the perfect substrate for planting daisies is made by crushing eight-balls (八) with a crow bar (亅).

儿 = 丿 + 乚 : Mnemonic symbol: "son" (儿) sounds similar to "Sun" like in "Sun Wu Kong", so it's gonna be represented by the monkey king. Albert Einstein (Ø-) and Sun Wu Kong (儿) are fighting in the space station's kitchen (-Ø2). Their weapons: Albert Einstein has a shovel (乚), and Sun Wu Kong has a banana (丿).

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.