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.
10 astronomy facts. It is often referred to as the final frontier. Astronomy is an exciting field that most people have at least some interest in. There are literally hundreds of facts that we could go through, below we narrow it down to 10 major facts in no particular order: