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.
museums have sections on astronomy and hold weekend, evening, and summer programs on astronomical sciences. Astronomy serves as an introduction to science for nearly 10 percent of all college studentsâmore than 200,000 each year, nationwide. For many, astronomy will be the only science course they will ever take.