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A yawn (from the Middle English yanen, an alteration of yonen or yenen, which in turn comes from the Old English geonian), is a reflex of simultaneous inhalation of air and stretching of the eardrums, followed by exhalation of breath. Pandiculation is the act of stretching and yawning simultaneously. Yawning is associated with tiredness, stress, overwork, lack of stimulation, and boredom...

These stunning shots show the beautiful and eerie underwater world of a Swiss ice-filled Alpine lake. Taken in Lake Sassolo, close to the southern border with Italy, these were taken by diving photographer Franco Banfi. Although the high altitude region is known for its sunny weather, the lake was formed by the run-off of the Alps surrounding it. The giant ice structures dwarf the tiny divers as they explore the nooks and crannies of the icebergs...

Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate (or craniate) animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

A military aircraft is any fixed-wing or rotary-wing aircraft that is operated by a legal or insurrectionary armed service of any type. Military aircraft can be either combat or non-combat: • Combat aircraft are aircraft designed to destroy enemy equipment using their own armament. Combat aircraft are normally developed and procured only by military forces. • Non-combat aircraft are aircraft not designed for combat as their primary function, but may carry weapons for self-defense...