Pogona is a genus of reptiles containing eight species, which are often known by the common name bearded dragons. The term "bearded dragon" is most commonly used to describe the central bearded dragon, (Pogona vitticeps}. Members of this genus live in the arid, rocky, semidesert regions and dry open woodlands of Australia. They are adept climbers, spending time on branches and in bushes and near human habitation. Pogona species bask on rocks and exposed branches in the mornings and afternoons. They are found throughout Australia.
The reptiles of Australia are a diverse group of animals, widely distributed across the continent. Three of the four orders of reptiles are native to Australia: Testudines, Squamata and Crocodilia. The only missing extant order is Sphenodontia, containing the tuataras, which are endemic to New Zealand. Australia has a large diversity of reptiles, with over 860 species. This is rich in comparison to other continents. For example, North America has approximately 280 species of reptile. The most diverse group is Squamata, also known as the snakes and lizards. The snakes and lizards are especially diverse in the arid areas of Australia, where diversity of other fauna is generally low. Spinifex grass is a major habitat which allows them to remain in a relatively cool, moist area.
Australia has a large array of reptiles which can be dangerous to humans. The world's largest reptile, the saltwater crocodile (Crocodylus porosus), is native to Australia.
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows (see Incandescence). The hot filament is protected from oxidation with a glass or quartz bulb that is filled with inert gas or evacuated. In a halogen lamp, filament evaporation is prevented by a chemical process that redeposits metal vapor onto the filament, extending its life. The light bulb is supplied with electrical current by feed-through terminals or wires embedded in the glass. Most bulbs are used in a socket which provides mechanical support and electrical connections.
Incandescent bulbs are manufactured in a wide range of sizes, light output, and voltage ratings, from 1.5 volts to about 300 volts. They require no external regulating equipment, have low manufacturing costs, and work equally well on either alternating current or direct current. As a result, the incandescent lamp is widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps, and flashlights, and for decorative and advertising lighting.