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Mayflies(also known as shadfliesor fishflies in Canada and the upper Midwestern United States, as Canadian soldiers in the American Great Lakes region,[2]and as up-winged flies in the United Kingdom) are aquatic insectsbelonging to the orderEphemeroptera. This order is part of an ancient group of insects termed the Palaeoptera, which also ...
Compound eye of a house centipede Compound eye of a dragonfly. A compound eye is a visual organ found in arthropods such as insects and crustaceans.It may consist of thousands of ommatidia, [1] which are tiny independent photoreception units that consist of a cornea, lens, and photoreceptor cells which distinguish brightness and color.
HMA No. 1. His Majesty's Airship No. 1 was designed and built by Vickers, Sons and Maxim at their works in Barrow-in-Furness, Lancashire, England, as an aerial scout airship for the Royal Navy. It was the first British rigid airship to be built, and was constructed in a direct attempt to compete with the German airship programme.
Larvae can occur in high densities on the bottoms of shallow ponds and lakes up to an altitude of 1800 meters in the [Alps]. [1] Densities of 700-1700 larvae per square meter have been reported for C. luctuosa and C. horaria on bottoms covered with organic detritus or decaying leaves. Densities on mineral sediments are an order of magnitude ...
The "aerial screw" was one of several aerial machines drawn by Leonardo, including an early parachute, an ornithopter and a hang glider. The pen-and-ink sketch outlines an idea for a flying machine similar to a modern helicopter, with a spiral rotor or "aerial screw" based on a water screw, but intended to push against the fluid of the air ...
But much like when many were working on Biden’s campaign — although to a lesser degree — Harris aides and other Democratic operatives say they know they’re still running up against voters ...
Since the big of draw of the Harvest Moon is that it brightens the evening sky around sunset for several days in a row, you most likely will be taking in the view when the moon is close to the ...
United Kingdom. Manufacturer. Lillian E. Bland. First flight. August 1910. Number built. 1. The Bland Mayfly was an early aircraft constructed in 1910 by Lilian E. Bland in Carnmoney in Ireland. It is credited as the first aeroplane to be designed and constructed by a woman.