Chemical bonding happens when two or more atoms join together to form a molecule. It is a general principle in science that all systems will try to reach their lowest energy level, and chemical bonding will only take place when a molecule can form that has less energy than its uncombined atoms.hemical bonding happens when two or more atoms join together to form a molecule. It is a general principle in science that all systems will try to reach their lowest energy level, and chemical bonding will only take place when a molecule can form that has less energy than its uncombined atoms.
Human beings were able to create tools around 2.5 million years ago-but we first made bows and arrows 64,000 years ago. The invention of the weapons was a huge leap for our ancestors, enabling them to hunt far more effectively.
With the compound bow, other areas to concentrate on are the size and weight of the cams and friction in the axles and cable guard. Because Flight bows are very short, and the arrows shot are of the order of 14 to 15 inches in length, they are usually fitted with a handle in front of the riser. And as they are centre shot, using a release aid, their risers normally have a hole in the centre through which the arrow passes (see picture, right).