The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
Biology Is Studied at Many Levels of Organization (Part 2)
Plant Cell Types (Part 3)
The Big Five Personality Dimensions
The Freudian Structure of Personality
How to find the definite integral using the fundamental theorem of calculus (Part 1)
How to solve exponential equations without logarithms (Part 2)