Ключевые слова: attract, attracting, attraction, background, blue, closeup, concept, effort, element, equipment, experiment, field, force, gravitation, gravity, horseshoe, induction, iron, lab, laboratory, light, magnet, magnetic, magnetize, metal, nails, north, object, physics, polarity, polarize, power, red, school, science, scientific, shape, sign, south, steel, strength, table, wooden,