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Hydrogen gas was first artificially produced in the early 16th century, via the mixing of metals with acids. In 1766–81, Henry Cavendish was the first to recognize that hydrogen gas was a discrete substance, and that it produces water when burned, a property which later gave it its name: in Greek, hydrogen means "water-former".

When it is burned what does hydrogen make?
Answer: water
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The essence of air defence is to detect hostile aircraft and destroy them. The critical issue is to hit a target moving in three-dimensional space; an attack must not only match these three coordinates, but must do so at the time the target is at that position. This means that projectiles either have to be guided to hit the target, or aimed at the predicted position of the target at the time the projectile reaches it, taking into account speed and direction of both the target and the projectile.

What is the first purpose of air defence?
Answer: detect hostile aircraft
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A cabinet of coins is the Münzkabinett der TUI-AG. The Polizeigeschichtliche Sammlung Niedersachsen is the largest police museum in Germany. Textiles from all over the world can be visited in the Museum for textile art. The EXPOseeum is the museum of the world-exhibition "EXPO 2000 Hannover". Carpets and objects from the orient can be visited in the Oriental Carpet Museum. The Blind Man Museum is a rarity in Germany, another one is only in Berlin. The Museum of veterinary medicine is unique in Germany. The Museum for Energy History describes the 150 years old history of the application of energy. The Home Museum Ahlem shows the history of the district of Ahlem. The Mahn- und Gedenkstätte Ahlem describes the history of the Jewish people in Hanover and the Stiftung Ahlers Pro Arte / Kestner Pro Arte shows modern art. Modern art is also the main topic of the Kunsthalle Faust, the Nord/LB Art Gellery and of the Foro Artistico / Eisfabrik.

Other than in Hanover, where else can you find a Blind Man Museum?
Answer:
Berlin