දත්වල ඇති එනමලය කිසියම් දියකිරීමක් කරන්නට ඇඹුල්වල ආම්ලික ගතියට හැකියාවක් ඇත. එනිසා දත්වල ඇති ස්නායු පිටතට විවෘත වන නිසා දත් හිරිවැටීමක් වැනි දෙයක් සිදුවේ.
Television
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 […]
ලොව වැඩිම ප්‍රමාණයක් මිරිදිය ජලය අන්තර්ගත වී ඇත්තේ කුමන ස්ථානවල ද?
එක්සත් ජනපද භූ විද්‍යා සමීක්ෂණයට අනුව ලෝකයේ මිරිදිය සම්පත් සඳහා මගපෙන්වීමෙ හි ලෝකයේ මුළු ජල ප්‍රමාණයෙන් 96% කට වඩා වැඩි ප්‍රමාණයක් එහි සාගරයේ රඳවා ඇති බව සඳහන් වේ. කෙසේ වෙතත් එය මූලික වශයෙන් ලුණු ජලයයි. ලෝකයේ මිරිදිය ජලයෙන් වැඩි ප්‍රමාණයක් සොයා ගැනීමට ඔබ ධ්‍රැව වෙතට යා යුතුය. ඒ අනුව ලොව වැඩිම ප්‍රමාණයක් මිරිදිය ජලය අන්තර්ගත […]
World Teachers’ Day: Why Do We Celebrate?
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 […]
Why Do Vehicles Have Fuel Doors on Different Sides?
Car manufacturers could easily produce all cars with the fuel door on the same side. But they don’t do it for a matter of practicality. When traffic is heavier and more refuellings are made, if all the cars were with the tank flap on the same side, only one side of the pumps would be […]
International Friendship Day: Why Do We Celebrate It?
The UN established the International Friendship Day through the resolution 65/275, to lay the foundations for a better world and prevent future conflicts. The resolution emphasizes the involvement of young people. As future leaders, they should be actively involved in the community. So, it was set up to ensure that they themselves promote a spirit […]
Hypervelocity Impact
This image shows the results of a lab test impact between a small sphere of aluminum travelling at approximately 6.8 km/second and a block of aluminum 18 cm thick. This test simulates what can happen when a small space rubble object hits a spacecraft. In such an impact, the pressure and temperature can exceed those […]
Before Being a Child, Mowgli Was a Young Man
Kipling presents Mowgli to his readers for the first time not as a child, but as a young man. In the short story “In the Rukh” (“In the forest”), contained in the 1893 collection Many Inventions, Mowgli enlists as a British forestry official. Kipling describes him as a very experienced guy in the Indian jungle. […]
Does The Moon Emit Its Own Light
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. […]
Why Are Hot Stars Blue And Not Red
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.