Great article on pull-ups, useful for beginners (although it calls them chin-ups). Overhand grip is pull-ups .underhand is chin-ups (where I come from! One of the best compound exercises for b (Fitness For Beginners Bodybuilding)
PHD Comics: Gravitational Waves Explained Simple explanation but really interesting for further understanding on gravitational waves. "That's one small step for man, one giant leap for mankind" Neil Armstrong quote Mehr
Quantum Equation Suggests The Big Bang Never Occurred – The Universe Has No Beginning - they repeatedly ask, "Who is "that" guy" [who first caused space to expand], Really? Scientists can be such brilliant dunces sometimes.