Cost of literacy should be affordable for everyone.

Child labour should be eradicated.

Air flows at different velocities within a pipe cross section . For a well developed ideal flow , the velocity of pipe will be higher near the pipe's center and decreasing towards the pipe wall in symmetrical manner.

The relationship between a task environment and general environment can be described as

one way system( changes in the task environment affect the general environment but changes in the general environment do not affect task environment.)

Many metals, like silver, copper, gold and aluminum, are very good heat conductors.