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Not all deaf people were born deaf; some are deaf due to disease or injury. I am half deaf, one ear has a lot of hearing loss but the good ear works harder to overcome this. I have trouble echo locating and understanding what I hear in noisy environments.

The human range for frequencies is roughly 200 to 2000 hertz. Most speech sounds are in the mid range. Children can hear higher than 2000 hz; this ability gets lost due to loud noises (rock concert loud) and age.