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Did you know?
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.
Did you know?
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.