Kilobytes Megabytes Gigabytes. The size of information in the computer is measured in kilobytes, megabytes, gigabytes, and terabytes. In this section, we'll look at common sizes you would see in real life, and work some arithmetic. Any thinking person today should have a rough idea of what KB, MB and GB are.
The maximum upper range of human hearing is about 20 kHz for children, declining to 15-17 kHz for middle-age adults. The top end of a dog's hearing range is about 45 kHz, while a cat's is 64 kHz.
Bats (order Chiroptera) have the most acute hearing of any non-aquatic animal, due to their ultrasonic echolocation. Most species use frequencies in the 20-80 kHz range, although some can hear frequencies as high as 120-250 kHz, compared with almost 20 kHz for the human limit and 280 kHz for the common dolphin (Delphinus delphis).