Rational Method is a rather conservative method. One of the basic assumptions of the rational formula is that the rainfall intensity must be constant for an interval at least equal to the time of concentration. For long duration of rainfall, this assumption may not hold true.
The puzzle piece was first associated with Autism Awareness when it was used within the logo for National Autistic Society in the UK in 1963. The logo of the society was designed by a neurotypical parent of an Autistic child who was a member of th...
Puzzles are a great educational toy for kids. So, what are the best puzzles for children and why are puzzles so important for kids to play with? Puzzles have been around since the late 1700's. They originated when British map makers designed puzzles as a way to teach others about geography and the world.