Did You Know? Interesting facts!!!

1.What material is money made out of?

The ordinary paper that consumers use throughout their everyday life such as newspapers, books, cereal boxes, etc, is primarily made of wood pulp; however, United States currency paper is composed of 75% cotton and 25% linen.

2.How was oxygen discovered?

Discovery of Oxygen. Oxygen was discovered in 1774 by Joseph Priestley in England and two years earlier, but unpublished, by Carl W. Scheele in Sweden. Scheele heated several compounds including potassium nitrate, manganese oxide, and mercury oxide and found they released a gas which enhanced combustion.

3.How loud can humans hear?

The average person can hear sounds down to about 0 dB, the level of rustling leaves. Some people with very good hearing can hear sounds down to -15 dB. If a sound reaches 85 dB or stronger, it can cause permanent damage to your hearing.

4.When was the first website launched?

The link is a snapshot of the CERN site, the first website, as of November 1992. The Web was publicly announced (via a posting to the Usenet newsgroup alt.hypertext) on August 6, 1991. Originally Tim Berners-Lee's web catalog at CERN.

5.What makes the sky blue?

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

6.Why the snow is white?

White is the result of reflection of all colors. Snow and snowflakes are ice crystals mixed with air molecules. The air gaps between crystals, along with the crystals' complex shapes, bounces the light beams around so much that all the wavelengths eventually get reflected out, giving it a white color.

7.Which country first adopted time zones?

On November 2, 1868, the then-British colony of New Zealand officially adopted a standard time to be observed throughout the colony, and was perhaps the first country to do so. It was based on the longitude 172°30′ East of Greenwich, that is 11 hours 30 minutes ahead of GMT.

8.What element is a diamond made of?

Diamonds are made up of the element carbon. Also, graphite is also made up of carbon. The only difference between the two is the way that the atoms are bonded together.

9.Which is the most common element on earth?

On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%).

10.How old is The Great Wall?
The Great Wall of China was built over 2,000 years ago, by Qin Shi Huangdi, the first emperor of China during the Qin (Ch'in) Dynasty (221 B.C - 206 B.C.). In Chinese the wall is called "Wan-Li Qang-Qeng" which means 10,000-Li Long Wall (10,000 Li = about 5,000 km).