Aerospace engineers design aircraft, spacecraft, satellites and missiles, according to the BLS. In addition, these engineers test prototypes to make sure that they function according to plans.
1 Try a deload every six weeks or so. 2  Most serious coaches recommend three or four weeks on, one week off to their intermediate and advanced trainees. 3  These are people competing in strength sports and pushing serious weight, so you may not have to deload quite so often.
Grinding and Clenching. 1  You brush and floss your teeth, you go to the dentist 3-4 times a year, you do what the dentist recommends and you get a clean bill of health each time. If you keep this up, you would expect to hang on to your teeth as long as you live.