Knowledge Wallet

Quiz on famous personalities in India. Hello here is a Quiz on famous personalities in India

General Knowledge Quiz about basic things you should know

The article is about what are fidget sinners made for A fidget spinner is a palm-sized, propeller-like object with three blades and a circular pad in the centre. One needs to spin it and balance the central pad on the fingers or palm. l Fidget spinners are toys used to calm fidgety people and work as a stress reliever. They help people suffering from Attention Deficit Hyperactivity Disorder Fidget spinners are available in various options—plastic, metal and with or without lights. The first fidget spinner was designed in the US by two 17-year olds, Allan Maman and Cooper Weiss, and their physics teacher, Eric Savino. They created the spinner by printing it on their school’s 3D printer in October 2016. The product was made for Allan to counter his ADHD. Within no time, the fidget spinner became a sensation. The trio bought eight 3D printers and relocated to Cooper’s basement to match production demands. However, demand quickly outstripped this capacity too and they had to move t

 The article about solstice meaning, The longest day of the year is called the summer solstice and the shortest day is called the winter solstice. In the Northern Hemisphere, the summer solstice is usually observed on June 21 and the winter solstice around December 21. There are two days in the year when day and night are of equal duration. These days are called equinox days. The summer solstice occurs when one hemisphere of the Earth tilts the most towards the sun and receives maximum sunlight.

This is the article on How do plants and trees help the environment? DO TREES REDUCE AIR POLLUTION LEVELS? The relationship between trees and air pollution is a complicated one. Particulate matter suspended in polluted air tends to settle onto leaves, and certain gases including nitrous dioxide (NO2) are absorbed by leaves’ stomata, filtering the air and reducing pollution levels slightly. But trees and other vegetation also restrict airflow in their immediate vicinity, preventing pollution from being diluted by currents of cleaner air. In particular, tall trees with thick canopies planted alongside busy roads can act like a roof, trapping pockets of polluted air at ground level. To reliably improve air quality, city planners need to give careful consideration to how trees are placed.