Water evaporates when the sun shines on oceans,seas,or wet grounds or when wind blows over them. The water vapour rises up and gets converted again into tiny droplets on reaching the cold heights of the

the north and south poles have two seasons: summer and winter . each season lasts for six months. the difference between the two seasons is more a matter of daylight than of temperature. although both

We do not need to protect ourselves against all bacteria. some live inside our body and are even very important to us,such as the intestinal bacteria. we fall sick only if there are too many bacteria or

Girls also undergo a voice change,buy it is not as pronounced as in boys. the larynx in the throat is responsible for the voice and the vocal cords are present inside it . in children, the vocal cords

The chairs of flying swings do not fly away because of the long chains holding them. Similarly,satellites remain in their orbits because of the gravitational attraction of the Earth.At the same time they

all great apes threatened with extinction live in the west forests of the tropics or in its bordering areas. The western gorillas live in the dense forests of the Central African countries; their relatives

American astronaut Neil Armstrong was the first man to set foot on the moon.on july 21,1696,he climbed down from Eagle,the landing crafts of Apollo 11,and walked on the surface of the moon.Moments later,his

Fish move by flapping their fins or through wriggling movements of their body. In addition , they have an air bladder, which they can fill with gases when needed , These features make them lighter and

The Babylonians lived in Mesopotamia,the land between the two rivers, Euphrates and tigris in Iraq , They followed the advanced cultures of the Sumerians and the Assyrians. In 1700 BC,king Hammurabi passed

An adult has about 5-6 litres of blood in his body? the heart of an adult pumps around 7000 litres of blood through the body every day? This could fill about 35 bathtubs! Crabs have blue-coloured blood?

in the earths core a viscous mass containing iron moves around a solid iron core, According to scientists, this flow of iron acts like an electrical coil and is the cause of the earth's magnetic field,

polar lights or aurora are bright bands of light that streak in the sky of the polar regions. the sun emits high-energy on particles., also known as solar wind , get deflected by the earths magnetic field

An advertising poster for Adolf Hitler and the NSDAP (around 1930): The advertisement addressed the mass of the unsatisfied unemployed, in order to have their support to the National Socialist Party. This

****** THE UNIQUE EARTH****** *unlike the other planets of our solar system, life developed into many forms on the Earth after its emergence. liquid water and oxygen for breathing made this possible, Millions

Wonders all around: many natural phenomena occurring in the depths of outer space and on the earth fascinate us. Red, glowing lava streams erupt from volcanoes. Earthquakes make the ground tremble and

A clear rejection is always better than a Fake Promise

কখনো কখনো মানুষ better এর খোজ করতে গিয়ে best মানুষ গুলোকেই হারিয়ে ফেলে....