晶體

晶 = 日 : Joan of Arc (ji) wants to solve the atomic structure of the sun, and so she uses a lot of suns (日) to create a crystal (晶) for X-ray crystallography in front of the engine ((e)ng1).

体 = 亻 + 本 : Rosa Luxemburg envies Mother Teresa's hot body. She asks her how she can be such a hottie even when lifting is not possible, like in the space station's zero gravity, and Mother Teresa answers that it's because of the roots she's eating.