Franz Anton Mesmer spoke of the stars, animal magnetism and magnetic fluids. Somerville extended her studies into astronomy, chemistry, geography, microscopy, electricity and magnetism. Electric motors operate on three different physical principles&colon; magnetism, electrostatics and piezoelectricity. He attracted students to evening scientific demonstrations on electricity, heat, magnetism, and gravity. This effect is known as lightning-induced remanent magnetism, or LIRM. Her Semblance is "Polarity", which is the ability to manipulate objects with magnetism. Various scientists proposed that electricity and magnetism were linked. He is regarded by some as the father of electrical engineering or electricity and magnetism. Such naturally occurring ferromagnets were used in the first experiments with magnetism. Leedskalnin became interested in the general theory of magnetism. It includes many classic books on electricity, magnetism and optics. Laputa purportedly levitated through use of artificial magnetism. This will cause the motor to generate power after building up its residual magnetism. The TIMSS test covered scientific understanding of magnetism. Zirconium is used in applications demanding chemical resistance or lack of magnetism.