Every boater should know this knot, no excuses. It is the most useful knot to know. The beauty of this knot is that it is a self tighnening knot. So the harder you pull on it, the tighter it gets. When the tension is released, it is a sinch to undo. Among many other uses, it is the best knot for towing, short of having a clip. View the video

The rotation of the moon—the time it takes to spin once around on its own axis—takes the same amount of time as the moon takes to complete one orbit of the Earth, about 27.3 days. This means the moon's rotation is synchronized in a way that causes the moon to show the same face to the Earth at all times. One hemisphere always faces us, while the other always faces away. The lunar far side (aka the dark side) has been photographed only from spacecraft.