People can fall: â  from the edge of a completed roof; â  from the edge where work is being carried out; or â  through openings or gaps. Edge protection Unless the roof parapet provides equivalent safety, temporary edge protection will be required during most work on flat roofs.
Why is astronomy considered the original science? Astronomy is the oldest science for our ancients either drew or made structures according to seasons or movements of celestial bodies in our Universe.
Astronomy is a study of the stars, planets and other phenomenon in space. Since the first humans looked at the skies, there has been astronomy. Many people have been significant over the years, like Copernicus and Galileo, and many individuals have made special contributions to astronomy, but you can't say when astronomy began.