The light we use today in our homes and offices comes more than 150 years ago. Throughout the nineteenth century, inventors produced simple electric lights. For example, Joseph Swan produced a simple electric light. But, he struggled to maintain a power source and the filament soon burned out when the vacuum was exhausted. Thomas A. […]
On December 17, 1903, Wilbur and Orville Wright (Wright brothers) piloted the first powered, sustained, and controlled flight. Within a few years, airplanes were successfully navigating long distances and soon began to transform both wartime and global travel. Most airplanes are flown by a pilot on board the aircraft. But some are designed to be […]
The Internet is a networking infrastructure. Whereas the World Wide Web is a way to access information over the medium of the Internet. Sir Tim Berners Lee a British Computer Scientist, is considered the father and the founder of World Wide Web. In 1991, Berners-Lee announced the WWW software on Internet newsgroups, and interest in the project […]
The iPhone is a line of smartphones designed and marketed by Apple Inc. It’s mobile operating system is known as iOS . On January 9, 2007, Apple Inc. CEO Steve Jobs exposed the iPhone at the Macworld convention in San Francisco. The iPhone has generated large profits for Apple, making it one of the world’s most valuable […]
The invention of television was the work of many individuals. It rapidly developed during the 20th century as a result of the work of a number of people. On March 25, 1925, John Logie Baird gave the first public demonstration of televised images in motion. Afterwards, on January 26, 1926, he demonstrated the transmission of […]
Plants are a large group of living components in nature which has a has stems, leaves, roots, flowers, seeds etc. They are really important for the planet and for all living things. So let us learn about the diversity of plants briefly. Types of plants According to the ability of producing flowers plants can be […]
World Teachers’ Day, also known as International Teachers’ Day, is an international day held annually on October 5 since 1994. It recalls the signing of the 1966 UNESCO/ILO Recommendation concerning the Status of Teachers. World Teachers’ Day aims to focus on “appreciating, assessing and improving the educators of the world”. And also it provides an […]
During the day time, we can see things clearly. But we switch on the lights to see them at night. If we close our eyes we cannot see anything even during day time or at night with lights on. Why is that? So, let us find what requirements should be fulfilled to have “vision”. […]
We can see the bright moon in the night sky. Because of this you must have thought that it is a luminous object. But the moon does not emit its own light. We see it as a bright object because the rays of light emitted by the sun fall on the surface of the moon. […]
Which is hotter red or blue star. Blue stars are hotter than yellow stars, which are hotter than red stars. Blue light photons have a shorter wavelength and higher energy than those of red light. It takes a hotter surface to emit blue light, so cooler stars look more reddish than hotter stars.
