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A bicycle, also known as a bike, pushbike or cycle, is a human-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other. A person who rides a bicycle is called a cyclist, or bicyclist. Bicycles were introduced in the 19th century and now number about one billion worldwide, twice as many as automobiles. They are the principal means of transportation in many regions...

Russia (/ˈrʌʃə/; Russian: Россия, tr. Rossiya, IPA: /rɐˈsʲijə/), officially known as both Russia and the Russian Federation (Russian: Российская Федерация, tr. Rossiyskaya Federatsiya, IPA: (rɐˈsʲijskəjə fʲɪdʲɪˈratsɨjə)), is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

A wedding is the ceremony in which two people are united in marriage or a similar institution. Wedding traditions and customs vary greatly between cultures, ethnic groups, religions, countries, and social classes. Most wedding ceremonies involve an exchange of wedding vows by the couple, presentation of a gift (offering, ring(s), symbolic item, flowers, money), and a public proclamation of marriage by an authority figure or leader...

Sharks (superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago. Since that time, sharks have diversified into 440 species, ranging in size from the small dwarf lanternshark, Etmopterus perryi, a deep sea species of only 17 centimetres (6...

A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...