活性炭

活 = 氵 + 舌 : Helga Horse joined the traditional water bottle challenge and empties a bottle of water over herself in the observatory's kitchen. To raise the difficulty level, she only uses her tongue to hold the bottle.

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.

炭 = 山 + 灰 : Tecumseh (t) had a fire running in the anthill's bathroom (an4), but now it has already died down. With a fork (山) he is searching in the ash (灰) for the pieces and bits of charcoal (炭) that have formed during the fire.