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.
Tiny blades discovered in South Africa suggest early humans had advanced intelligence and modern culture 71,000 years ago. Small stone blades from South Africa dating to 71,000 years ago may be the earliest evidence of bow and arrows. The bow and arrow is an ancient weaponâgoing back at least 71,000 years, a study published in Nature suggests.