Category: Science

Printing Press at a Glimpse

The printing press was invented in 1440 in Germany by the goldsmith Johann Gutenberg but woodblock printing and movable type printing technologies were already developed in ancient China and later Korea in East Asia a few hundred years prior, printing methods based on Gutenberg’s printing press spread quickly throughout first Europeand then the rest of […]

How Drugs Help Athletes?

We all know that many athletes use drugs in competitions and end up their career in disaster after proving positive in athlete drug testing. I still don’t get the point how those athletes dare to use drugs to enhance their performance, even though they knew that there will be drug testing conducted in competitions. Perhaps […]

What cause Acid rains?

Acid Rain has been an increasingly serious problem since the 1950s, particularly in the NE United States, Canada, and W Europe, especially Scandinavia. The acid rain contains the form of precipitation (rain, snow, sleet, or hail) containing high levels of sulfuric or nitric acids (pH below 5.5–5.6). It is happen when sulfur dioxide and various […]