Sheet masks continue to own the skincare craze, but let us not forget the purifying elements of nature's most natural cleanser: mud. To bank on Earth's beautifying basics, we've rounded up the best face and body masks that really clean up. 1  Hokku Spa Technology Green Tea Volcanic Mud Facial Mask. 2  Borghese Moisturize Mud Mask for Face and Body. 3  Hokku Spa Technology Green Tea Volcanic Mud Facial Mask. 4  Borghese Moisturize Mud Mask for Face and Body.
The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions, humans can hear sound as low as 12 Hz. Humans are most sensitive to (i.e. able to discern at lowest intensity) frequencies between 2,000 and 5,000 Hz.heir hearing range varies by species; at the lowest it can be 1 kHz for some species and for other species the highest reaches up to 200 kHz. Bats that can detect 200 kHz cannot hear very well below 10 kHz. In any case, the most sensitive range of bat hearing is narrower: about 15 kHz to 90 kHz.
It is common for people to experience slight hearing loss as the age. This is caused by changes in the inner ear. An average middle-aged person can detect a maximum frequency of 12,000 Hz to 15,000Hz. Some animals have wider frequency ranges. For instance, dogs have an average frequency range of 67 to 45,000 Hz, and dolphins have a maximum frequency range of up to 100,000 Hz. Learn more about Human Anatomy