Science & Mathematics Questions & Answers

MAs you sip a hot liquid, air comes into your mouth along with it and cools the drink. Your saliva mixes in and cools it further. But hot stuff on your skin is just plain hot!

A few thousand million years from now, the Sun will run out of hydrogen at its center. Then the nuclear reactions will spread outwards into the region surrounding the Sun’s core. With more hydrogen to burn, the Sun will produce more energy, and it will swell up into a red giant star. As the Sun gets bigger and brighter, the …

Everything that is born must die. Not only living beings, but inanimate objects like stars too. The birth of a star The universe has massive clouds of hydrogen floating around. Sometimes, these clouds come together and form very dense and huge balls of hydrogen gas. As the clouds come close, their temperature increases. This is called a proto-star (original star). …

In November 1922 an English archaeologist, Howard Carter, found in Egypt the tomb of a pharaoh that was filled with wonderful, exciting treasure. Newspapers were full of stories of golden thrones, beds and chariots, of jeweled caskets, even of flowers still preserved in the dry, airless tomb. Carter, who was working for Lord Carnarvon, had been busy in the royal …

The first world map was chiseled on a clay tablet in ancient Babylon in 6 BC. The Greeks in 4 BC had similar maps though they correctly believed that the earth was not flat, but a sphere. The first reasonably accurate world map was drawn by hand on paper by Gerardus Mercator, a Flemish geographer. His first world map was …

Although coffee was drunk centuries ago in Ethiopia it did not come to Europe until the seventeenth century. Soon ‘coffee houses’ were to be seen in every city, the first in London being opened in 1652. These coffee houses became fashionable places where people met, and the famous Lloyd’s insurance association started in one in about 1688. Until the end …

Strange though it may sound, people around the world are ‘immortalizing’ loved ones by turning their ashes into diamonds. It is seen as a beautiful way to remember deceased parents, spouses, lovers, stillborn babies and even pets. The most famous among those who will rock on forever as priceless gems is likely to be the late pop star Michael Jackson. …

When the Sun rises all the stars disappear. The sun rays are so bright that stars are not visible to us. The sun generates so much brightness due to its immense heat. We can guess about this heat by reading following scientific facts about the sun. (1) The volume of the sun is about 1,300,000 times more than earth (2) …

The light of the sun changes the water into vapor and vapor rises into the sky with air. The temperature of earth’s atmosphere gets cooler as we go up. So after getting to a certain height the air laden with vapor cools. It cannot hold its moisture in the form of vapor. Consequently the extra part of moisture changes into …

Although rockets may have seem to be a very new invention, they are in fact very old. Not of course the type of rocket which takes people into space, but the sort we regard today as a firework. This type of rocket was known to the Chinese over thousand years ago!