假性

假 = 亻 + 叚 : Rosa Luxemburg and Joan of Arc want to go on vacation together, but they already used up all of their vacation days. That's why for the upcoming eye examination in the ashram's bathroom, they put in some glass eyes so that they will get a sick leave.

Mnemonic symbol: a fake eye, 假眼

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.