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A swimsuit, bathing suit, or swimming costume is an item of clothing designed to be worn while engaging in a water-based activity or water sports, such as swimming, water polo, diving, surfing, water skiing, or during activities in the sun, such as sun bathing. A swimsuit can also be worn as an undergarment in sports that require a wetsuit such as water skiing, scuba diving, surfing, and wakeboarding...

A twin is one of two offspring produced in the same pregnancy. Twins can either be identical (in scientific usage, "monozygotic"), meaning that they develop from one zygote that splits and forms two embryos, or fraternal ("dizygotic") because they develop from two separate eggs that are fertilized by two separate sperm. In contrast, a fetus which develops alone in the womb is called a singleton, and the general term for one offspring of a multiple birth is multiple...