气凝胶

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.

凝 = 冫 + 疑 : Someone ate one of Nefertiti's (ni) popsicles (冫) and now she rounded up her suspects (疑) in the engine's kitchen ((e)ng2). To make things easier she congregated (凝) the suspects into a sticky mess using the rest of her popsicles.

胶 = 交 + 月 : The moon (月) fell down from the heavens and lies shattered in front of the aorta (ao1). Joan of Arc (ji) and Linus Pauling (交) join forces to fix it with a lot of glue (胶).