The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
Did you know?
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
Did you know?
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
Refinement of skills and a growing sense of independence are most noted in toddlers
Eugène Delacroix, Liberty Leading the People.
Societal pressure to be thin can cause people to feel fat
Keep Your Bones Strong
Monkey Experiment: Sense of Fairness
Selected Broad Sense Heritability (H2) Values from Human Twin Studies