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Thunder is the sound created by lightning. Contingent upon the separation and nature of the lightning, thunder can go from a sharp, noisy break to a long, low thunder (brontide). The sudden increment in weight and temperature from lightning produces fast extension of the air encompassing and inside an electrical discharge  Thunder is brought on by lightning, which is basically a flood of electrons streaming between or inside mists, or between a cloud and the ground. The air encompassing the electron stream is warmed to as hot as 50,000 degrees Farhenheit, which is three times more sweltering than the surface of the sun. As the superheated air cools it creates a reverberating container of halfway vacuum encompassing the lightning's way. The adjacent air quickly grows and contracts. This causes the section to vibrate like a tubular drum head and delivers a gigantic split. As the vibrations bit by bit cease to exist, the sound echoes and resonates, producing the thundering we call thunder. We can hear the thundering blasts 10 miles or more far off from the lightning that created it.  At the point when the lightning is inside sight, in any case, we see it first on the grounds that the rate of sound in air is significantly slower that that of the electron stream. Therefore, the sound acts more like a stun wave than a customary sound wave. The stun wave takes after the way of the electrons like a clench hand in a sock. The pace of sound is significantly more irrelevant when contrasted with the velocity of light. The light from the glimmer contacts us in a small amount of a second, though the sound slacks along like a snail taking after an interplanetary rocket.

Sir James Dyson's company has developed a bladeless fan heater - a sci-fi creation that quickly warms an entire room without any visible moving parts.The stylish device, the 'Dyson Hot', is a world away from the noisy traditional fan heaters which have remained largely unchanged for more than 30 years.