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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

This girl’s photo illustrates the main features of fetal alcohol syndrome, including a flat nasal ... This girl’s photo illustrates the main features of fetal alcohol syndrome, including a flat nasal ...
Common skin signs are often evidence of an illness or disorder. A nodule is a larger papule; acne ... Common skin signs are often evidence of an illness or disorder. A nodule is a larger papule; acne ...
Central Nervous System Stimulants and Drugs for Attention Deficit/Hyperactivity Disorder and ... Central Nervous System Stimulants and Drugs for Attention Deficit/Hyperactivity Disorder and ...
Patient with DiGeorge syndrome. Note low set ears and wide set downward slanting eyes; often these ... Patient with DiGeorge syndrome. Note low set ears and wide set downward slanting eyes; often these ...
Drugs can be classified as prescription or over-the-counter (OTC) drugs Drugs can be classified as prescription or over-the-counter (OTC) drugs
The Neuromuscular Junction The Neuromuscular Junction
Video: Metaphase I Animation

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