We use the ‘Flesch–Kincaid Grade Level Formula’ to present scores as per US grade level. See all the grade levels here. Following articles, stories and features are appropriate for people at reading level of Grade 9 (Age 14-15 years). More information about Flesch–Kincaid readability tests can be found here.
156 items in this section. Displaying page 5 of 16
Who Invented Traffic Lights?
Long before roads needed traffic lights, railways were using a system of signals to control train traffic. In the early railways, a single track was used for both up-going and down-going trains, and safety depended on spacing the arrival and departure of trains according to time intervals. These signals consisted of a ball and something that looked like a kite. When the kite was raised on top it indicated danger while if the ball was raised, it indicated the all clear....
Why do Locusts Swarm?
Have you ever tried chasing a frisky grasshopper? If you have, you will definitely know that scampering after a jumpy bug is not an easy task. Most species of grasshoppers have a keen sense of hearing and the moment they sense trouble, they can hop fast and furious! Sometimes, shortage of food turns grasshoppers into migratory insects as they venture out in search of newer pastures. This situation happens when the species begins reproducing rapidly and does not have enough food for all the members of its community....
Why are Some Reptiles Brightly Coloured?
Most animals have skin colour that makes them merge into their surroundings. They become near invisible unless you look very closely. But some reptiles such as the sea-snakes, coral snakes and frogs of Central and South America are brilliantly coloured or have bright bands like deep yellow, orange, pink on their bodies. They are easily visible among the green leaves or brown earth. This is because these animals are poisonous. The colouring is a warning to other animals, especially their natural enemies, to avoid eating them....
Dinosaur eggs Found in Patagonia
The film Jurassic Park is peanuts compared to this: Last month, Argentine scientists found thousands of dinosaur eggs in hundreds of nests at Patagonia. A report in the journal New Scientist says that it is the biggest nesting site of dinosaurs found thus far. Each nest contained 15 to 30 eggs the size of a grapefruit each. The eggs contained bones of titanosaurs which would have weighed about 15 tonnes when fully grown. Close to 100 million years old dinosaur egg....
Mahavir Jayanti
You must have often wondered about the monks with shaven heads, a white robe and a fine muslin cloth covering their mouths and noses. They are monks who follow the Jain religion. They cover their mouths and noses to avoid any involuntary killing – even of germs. Sometimes they also carry small brooms to remove any small creature out of their way so that they do not unknowingly tread on it. Their lifelong attempt is to live by the principle of ahimsa or non violence....
Where are the Shaking Minarets?
Among the many architectural marvels of the world, like the leaning tower of Pisa, the whispering gallery at St Paul’s Cathedral at London or the musical pillars of South India, are the astonishing and historical shaking minarets of Ahmedabad, in Gujarat state, India. The minarets are so unique that if one minaret in shaken, the other sympathetically shakes too! Barely a kilometre away from the Ahmedabad city railway station is the Sidi Bashir mosque (Muslim equivalent of a temple) famed for its jhulta minars or shaking minarets (tall tower-like structures, either at the entrance gate or on the four corners)....
The Yellow River
October 21: The Yellow River has been called the cradle of the Chinese civilisation, just as the Indus River made it possible for the ancient Indian civilisation of Harappa and Mohenjodaro to flourish, the Tigris and Euphrates gave birth to the Mesopotamian civilisation (now in Iraq), and the Nile gave birth to the Egyptian civilisation more than 4000 years ago. The magnificent river runs 4345 km, and is second only to the Yangtse river. Called China’s sorrow because of its tendency to overflow and change its course, till date it has overflowed 1600 times and changed its course 26 times, affecting the lives of hundreds of thousands of people....
Scientists Find More on the Eureka Man
Why do ships float on water when in fact they should sink? Why does paper float on water and a paperweight sink? The answer to these questions was accidentally discovered 2200 years ago by the Greek inventor and mathematician, Archimedes. One day, while getting into his bath he noticed water spilling over the sides. In a flash, Archimedes realised the relation between the water that had fallen out and the weight of his body – in other words he discovered why some objects float and some sink!...
Deepavali: Festival of Lights
Deepavali – or Diwali – as is commonly uttered – literally means rows of lamps. These lamps light up houses all over the country, but for different reasons. In West Bengal, it is time to worship Kali, the goddess with the fearsome strength, and in Bihar and Uttar Pradesh it is time to remember Dhanvantari, the divine physician. To some, the lights are a reminder of the return of Rama to his home after 16 years of exile....
The Earthworm's Good Turn
Every day, countless dustbins are emptied in dumping grounds. A lot of this garbage ends up polluting the ground water and also the rivers and seas. Actually, a large part of this junk, especially the biodegradable waste (waste that can be decomposed) can be disposed in a more efficient manner, without polluting water bodies. Many countries are now doing it by using a cheap and eco-friendly option – the earthworm. Yes, earthworms have been in the business of decomposing waste and enriching the soil for thousands of years....