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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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Every flu season is different, and even healthy people can get extremely sick from the flu, as well as spread it to others. The flu season can begin as early as October and last as late as May. Every person over six months of age should get an annual flu vaccine. The vaccine cannot cause you to get influenza, but in some seasons, may not be completely able to prevent you from acquiring influenza due to changes in causative viruses. The viruses in the flu shot are killed—there is no way they can give you the flu. Minor side effects include soreness, redness, or swelling where the shot was given. It is possible to develop a slight fever, and body aches, but these are simply signs that the body is responding to the vaccine and making itself ready to fight off the influenza virus should you come in contact with it.

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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.

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Green tea is able to stop the scent of garlic or onion from causing bad breath.

Applying a surgical type of mask Applying a surgical type of mask
Switching of mating type in haploid yeast cells Switching of mating type in haploid yeast cells
A roller cell-type electric fuel pump. A roller cell-type electric fuel pump.
Model of a purple bacterial reaction center complex Model of a purple bacterial reaction center complex
Which outcome corresponds to the reaction:H3AsO4 + 3 OH- → 3 H2O + AsO43-? Which outcome corresponds to the reaction:H3AsO4 + 3 OH- → 3 H2O + AsO43-?
Type II curve. Mortality does not vary with age. Data for five-lined skink (Eumeces fasciatus). Type II curve. Mortality does not vary with age. Data for five-lined skink (Eumeces fasciatus).
Video: Introduction to Macular Degeneration

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