Phthalates are another class of chemicals that are often used in deodorants and antiperspirants that you may want to avoid. Phthalates are used in cosmetics, synthetic fragrances, plastics, body care products and medical goods. They help to dissolve other ingredients and to create a better consistency.
A harmonic is a signal or wave whose frequency is an integral (whole-number) multiple of the frequency of some reference signal or wave. The term can also refer to the ratio of the frequency of such a signal or wave to the frequency of the reference signal or wave.
The harmonic mean is a better average when the numbers are defined in relation to some unit. The common example is averaging speed. For example, suppose that you have four 10 km segments to your automobile trip. You drive your car: 1  100 km/hr for the first 10 km. 2  110 km/hr for the second 10 km.