Haptic is an adjective used to describe things related to our sense of touch.
In physics, plasma refers to one of the four states of matter. In medicine, plasma describes the part of blood that ferries cells, nutrients and more throughout the body.
Aerosols are tiny bits of solids or drops of liquids suspended in gas. Aerosols include mist, fog and soot, as well as pollution from fossil fuels.
Oxidation and reduction are two parts of a chemical process in which one atom steals electrons from another.
Mass shows how much an object resists speeding up or slowing down when force is applied — a measure of how much matter is in it.
Nicotine is an addictive substance found in tobacco plants. It's what makes it so difficult to quit smoking or vaping.
In chemistry, this attachment between atoms forms because of the power of attraction. Chemical bonds make up every solid object on Earth.
Pollen is a mass of tiny reproductive cells. These grains combine with egg cells to form seeds — but on the way, they can make some people miserable.
Metals are substances that can be elements, alloys or compounds. They all conduct heat and electricity and can be formed into different shapes.
A genus is a group of closely related species. It’s the first part of the two-part system called binomial nomenclature, used to name living things.
Alkaline chemicals are basic — substances that produce hydroxide ions in solution.
Pi is the ratio of a circle’s circumference to its diameter. But some mathematicians say life would be easier if we used a different ratio instead.