Ferrofluid (Invented by NASA)
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Ferrofluid is a liquid (such as water) holding tiny particles of iron compounds that become strongly magnetized in the presence of a magnetic field. You may ask: why don't the tiny particles ever settle out of the liquid to the bottom? The answer is that the particles are submicron size (i.e., nanoscale) so that the surface area of each particle is extremely large in relation to its mass. Because of the small particle size and large surface area, the particles attract and hold the molecules of liquid (such as water) by surface tension and/or "adsorption", thereby assuring that the magnetized particles cannot settle out of the liquid.
Ferrofluid was invented by NASA in 1963 (using rocket fuel as the liquid) as a way of ensuring that the rocket fuel otherwise "floating around" inside a tank in a weightless environment could be drawn toward a pump inlet by applying a magnetic field.
Recommended for Age 8 & Up (with adult supervision)