People grow two sets of teeth during their lifetimes the primary or baby teeth, and the second, permanent teeth. The first primary teeth appear when a child is about six months old. The rest of them erupt between sixth and thirtieth month, and there are only twenty teeth in this set. The permanent teeth in humans appear between the sixth and …

As many as eight people can fly aboard the space shuttle. One of them is the commander and another the pilot who flies the shuttle. The other members of the crew are called mission specialists and payload specialists. They operate the equipment taken into space by the shuttle.

There are two kinds of spring. One are called “Permanent Springs” and others “Intermittent Springs”. The water in Permanent Springs flow throughout the year. They get water from a deep point of water zone. In “Intermittent Springs” water flows generally in rainy season because the level of the water table is highest during that period. The openings of such springs …

A good question! We know that there are about one million different species of insect, but more are being discovered every day. Except for the sea, every place on earth has an insect population, and some of these insects are very useful indeed. The honey bee and butterflies are two the most useful, carrying pollen from one plant to another …

There are many kinds of clouds. They are always changing their shape. They are formed at different heights. There is different temperature at different heights. The clouds are formed according to the height of the moisture laden air. Clouds which are formed at the height of thirty to fifty miles are called ‘noctilucent’ clouds. After these highest clouds, there are …

The number varies because some people have much thicker hair strands than others but the average number is 144,000.

A bee taps 2 million flowers and flies 50,000 miles (80,000 kms) to make one pound (454 gm) of honey – travelling more than twice around the world to gather it. The basis of calculation is done after taking many facts for granted and the proof is often lost in the mists of time. C R Ribbands (1949) determined that …

Normally there are twenty two. They are all flat and irregularly shaped and they form the face and protect the delicate brain. The brain case is called the cranium, the back of the head is called the occipital plate and the front part between the eyebrow and where the hair line begins is the forehead.

About 200, including the small ones in the wrist, ankles and the lower end of the spine.

The Giraffe is easily the tallest of the mammals at 18 feet. Apart from its legs and neck another long feature of the giraffe is its tongue. When fully extended to pluck a distant leaf or twig, the Giraffe’s tongue is 17 inches long. The Giraffe feeds on the foliage of acacia trees on the savannahs of South Africa, and …