What does Carnegie's mother suggest by using the word "rough" to describe the men on the wharves?

In areas where even the experts disagree; everyone has a right to his own opinion. i mean if answers aren’t given just like in lots of things; then it has to be just anyone’s opinion. is this dualism multiplicity relativism or commitment

What is a system which kings rulers and other wealthy individuals provided financial and other support to artists? feudalism commissions partronage all of the above !

The great pyramid is 146 m high. how long is a ramp from the top of the pyramid to the ground that has a mechanical advantage of 4?