General Health » The Human Body
Read about what it means to have 20/20 vision.People often wonder what it means to have 20/20 vision. Discover what it means to have 20/20 vision and where the term comes from.
Learn what the three bones in the ear are called.
Find out how often the human eye blinks per second, day and year.
Learn what the seven endocrine glands are and their functions.
Find out what the largest organ in the human body is.
Find out whose brain was larger: Neanderthal man or modern man.
Learn about how many hairs the average person has on their head.
Find out if the nails and hair of a dead person continue to grow.
Find out of a person can get a suntan through a window.
Learn about what regulates body temperature in humans.
Read about the likely purpose of the human appendix.
![Some people need to wear corrective lenses to improve their vision. [©Shutterstock, 2010]](/image/350x200/2711_what_does_it_mean_to_have_20_20_vision.jpg)
![The three smallest bones in the body reside in the ear. [©Shutterstock, 2010]](/image/125x125/2713_what_are_the_three_bones_in_the_ear_called.jpg)
![Blinking clears foreign substances from the eye and keeps it moist. [©Shutterstock, 2010]](/image/125x125/2709_how_often_does_the_human_eye_blink.jpg)
![The body contains seven hormone-secreting endocrine glands. [©Shutterstock, 2010]](/image/125x125/2701_what_are_the_seven_endocrine_glands.jpg)
![Most people do not realize that the largest organ is the skin. [©Shutterstock, 2010]](/image/125x125/2700_what_is_the_largest_organ_in_the_body.jpg)
![The size of a human's brain does not necessarily reflect its cognitive capacity. [©Shutterstock, 2010]](/image/125x125/2699_what_brain_is_larger_neanderthal_man_or_modern_man.jpg)
![It would take a long time to count the individual hairs on a person's head. [©Shutterstock, 2010]](/image/125x125/2724_how_many_hairs_does_the_average_person_have_on_their_head.jpg)
![Healthy hair is often lustrous and full of volume. [©Shutterstock, 2010]](/image/125x125/2720_do_the_nails_and_hair_of_a_dead_person_continue_to_grow.jpg)
![A family peers through an open window on a beautiful day. [©Shutterstock, 2010]](/image/125x125/2716_can_a_person_get_a_suntan_through_a_window.jpg)
![Different sections of the brain control various different aspects of the body's function. [©Shutterstock, 2010]](/image/125x125/2697_what_regulates_body_temperature_in_humans.jpg)
![The digestive process involves several of the internal organs. [©Shutterstock, 2010]](/image/125x125/2695_what_was_the_likely_purpose_of_the_human_appendix.jpg)