People were quite aware of certain new techniques in metallurgy. They used these techniques to produce lead, copper, tin, and bronze. These metal products were popular items for export to oversea civilizations.

They were the world’s first dentists

During most of the Stone Age, people in Egypt, like people everywhere else in the world, lived by hunting and gathering their food. They traveled around from place to place in the Nile Valley, harvesting wild grasses, digging up roots, picking berries, and finding bird eggs

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"Movies" is short for "motion pictures," and the development of pictures that seem to move has taken place over many years, thanks to the work of many people.

The crossword puzzle was both a new thing and a not-so-new thing. Since ancient times there had been what is called a word square. In a word square, the letters spelled the same words horizontally and vertically.

Men and women have dressed and done things to their hair as far back as there are any records of human beings. An interesting thing is that dressing the hair was not a mark of "civilization."

The Christmas tree is the symbol of the spirit of the Yuletide in many homes. The use of the Christmas tree is a custom and tradition, not a religious observance.

Akbar was the greatest of the Moghul emperors, consolidating a large empire across India, and establishing a culture promoting the arts and religious understanding. Akbar was the son of Humayun, grandson of Babur, and became the third Moghul Emperor.

Living cells divide to form new cells in order to repair worn-out or damaged tissues throughout an organism and to enable the exchange of genetic material at the initial stage of the process of sexual reproduction.

Before time zones were set up, there was a great deal of confusion, espe­cially when people had to use railroad timetables. To end this confusion the United States in 1883 began using a system of standard time zones.

The idea of the elevator was not invented by one man; it was developed over a long period of time. This is because the mechanical principles of elevators had been in use for centuries.

Aardvarks are small pig-like mammals that are found inhabiting a wide range of different habitats throughout Africa, south of the Sahara.

In the early 1900s African Elephant populations were estimated to be in the millions, while there were around 1oo,000 Asian Elephants. According to World Wildlife Fund, today there are around 700,000 African Elephants in the wild, and just 32,000 Asian Elephants.

Elephants have the longest pregnancy in the animal kingdom, lasting 22 months from conception to birth. Elephants can give birth every three to four years, but will typically only have four calves in their lifetime.

Elephants have deep family bonds and tight-knit groups of related females and their offspring.  Each herd consists of anywhere from 8-100 Elephants, all led by the oldest (and often largest) matriarch.

The caiman lizard is a medium sized species of lizard, natively found in the jungles of South America. The caiman lizard is powerfully built and is one of the largest lizard species on the American continent.

There are six species of caiman found in a variety of wetland habitats throughout Central and South America. Caimans are most closely related to alligators with which they share a number of similar characteristics.

Nature doesn't care about emotions. We watch lions just tearing up gazelles willy-nilly and animals just leaving their dead to rot. But a few animals have developed at least a little bit of feeling (or a lot of feelings, as we are reminded whenever we are around moody teenagers).

The desert tortoise is a medium-sized species of tortoise that is found in the south-western desert regions of Northern America, and parts of northern Mexico.

About three thousand years ago, a Chinese emperor kept a collection of animals in what he called an "intelligence part." If the emperor kept the animals alive to study them and learn something of their habits, then this was perhaps the first zoo, because today this is what a zoo is a large

It makes sense that the term “Black Friday” might refer to the single day of the year when retail companies finally go “into the black” (i.e. make a profit).

uring most of the Stone Age, people in Egypt, like people everywhere else in the world, lived by hunting and gathering their food. They traveled around from place to place in the Nile Valley

The idea of a police system to protect a city originated in London. In 1737 a law was passed creating a police system with 68 men. But as the city grew and poverty increased, looting and rioting were soon out of control in London.

A vital and thriving trade center of Indus Valley civilization, Lothal had the world’s earliest known dockyard. Spanning an area 37 meters from east to west and nearly 22 meters from north to south,

Asteroids are small, rocky solar system bodies that populate interplanetary space out to the orbit of Jupiter. There are millions of them, and they are often grouped by their composition.

Pluto used to be known as the smallest planet in our solar system, and the furthest planet from the sun. Pluto was discovered in 1930 by Clyde Tombaugh, an American astronomer. Pluto is over 5.8 billion km (3.6 billion miles) away, and it takes Pluto 248 years to orbit the sun.

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Toxic waste generated in the process of extraction, transformation or production of any industry considered as a threat to the balance of ecosystems, because, they cannot be reused and their characteristics remain as toxic, corrosive, flammable or explosive hazardous