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Aircraft are vehicles which are able to fly by being supported by the air, or in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. Although rockets and missiles also travel through the atmosphere, most are not considered aircraft because they use rocket thrust instead of aerodynamics as the primary means of lift...

Sleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli, and is more easily reversible than being in hibernation or a coma. Sleep is a heightened anabolic state, accentuating the growth and rejuvenation of the immune, nervous, skeletal and muscular systems...

Insanity, craziness or madness is a spectrum of behaviors characterized by certain abnormal mental or behavioral patterns. Insanity may manifest as violations of societal norms, including becoming a danger to themselves and others, though not all such acts are considered insanity. In modern usage insanity is most commonly encountered as an informal unscientific term denoting mental instability, or in the narrow legal context of the insanity defense...

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...

Lion Sands Private Game Reserve, also known as Lion Sands Reserve, was established in 1933 by Guy Aubrey Chalkley, and forms part of the Sabi Sands Private Game Reserve, situated on the western border of the Kruger National Park, which together with some other parks make up the Greater Kruger National Park. Wildlife The wildlife in the park includes the Big Five. In Africa, the big five game animals are the lion, African elephant, Cape buffalo, leopard, and rhinoceros...

The bikini is typically a women's swimsuit, either a one-piece or a two-piece. For the two-piece, one part of the attire is covering the breasts; the other the groin and, optionally, part or all of the buttocks, leaving an uncovered area between the two. The bikini is often worn in hot weather, while swimming or sunning. A bikini is also often worn as an undergarment to the wetsuit for waterskiing, scuba diving, surfing, and wakeboarding...