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.
The Arrow was a supersonic jet fighter and attack aircraft that was being designed by Canadian-based Avro Canada in the 1950s. It would have been Canadaâs first supersonic jet fighter â the CF-100 Canuck fighters, also built by Avro, were fine aircraft for their time, but could not break the speed of sound. The Arrow was cancelled abruptly by then-Prime Minister John Diefenbaker in 1959.