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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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

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Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Major types of plant secondary metabolites Major types of plant secondary metabolites
Secondary meristems generate wood and bark. Secondary meristems generate wood and bark.
Primary and secondary immune responses. Primary and secondary immune responses.
Levels of Prevention Levels of Prevention
Typical secondary ignition pattern. Note the lack of firing lines on superimposed pattern. Typical secondary ignition pattern. Note the lack of firing lines on superimposed pattern.
Hand exercise devices build strength for injury prevention. Hand exercise devices build strength for injury prevention.
Video: Proteins

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