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Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

Comparison of the chemical structures of psilocybin and LSD. Psilocybin (left) is derived from a mu Comparison of the chemical structures of psilocybin and LSD. Psilocybin (left) is derived from a mu
A chart derived from a flow sheet. A chart derived from a flow sheet.
How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay? How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay?
Use of squid giant axons for studies of neural transmission Use of squid giant axons for studies of neural transmission
Experimental deforestation of the Hubbard Brook watershed Experimental deforestation of the Hubbard Brook watershed
Selected Broad Sense Heritability (H2) Values from Human Twin Studies Selected Broad Sense Heritability (H2) Values from Human Twin Studies
Video: ADH and the arterioles, kidneys, sweat glands and the Atrial natriuretic peptide (ANP)

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