Lack of sleep can affect your immune system and reduce your ability to fight infections.

Each nostril of a human being register smell in a different way. Smells that are made from the right nostril are more pleasant than the left. However, smells can be detected more accurately when made by the left nostril.

Oslo, Norway is the world's most expensive city. A gallon of gas costs almost $8, and it costs $1.32 to use the public restrooms.

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