A group of scientists at the University of Zurich have just answered one of humanity's most important questions – what makes for an attractive penis? A recent study published in The Journal of Sexual Medicine asked women for their preferences on male genitalia. Here's a list of what was most important to them.

As a rule of thumb, always go natural where possible. And the same applied when choosing wild salmon over farmed salmon. The latest health studies however reveal that farmed salmon may actually be better than wild salmon in a number of ways.

Have you ever wondered what the extra hole in your running shoe really does? Turns out there is a reason why it is there.

Calisthenics are a form of exercise to increase body strength, body fitness and flexibility through movements using one's body weight for resistance. When performed vigorously and with variety, calisthenics can provide the benefits of muscular and aerobic conditioning, as well as balance, agility and coordination. Interested to give it a try? Start here.

Despite being a poor starter, Usain Bolt holds the 100m record in sprinting. In this video, he talks us through his race from start to finish, and what goes through his mind in those moments.