The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Did you know?
Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.
Did you know?
The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
Apparent and True Orbits of Alpha Centauri.
True Friendship
Hearing and Reading Words
A recruiting poster for the “True Sons of Freedom” encouraged African Americans to enlist. In fact,
Children can fast map the meanings of words in a single exposure.