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.
Not to be confused with the television series Arrows (TV series) or The Arrow. For other uses of Arrow, see Arrow (disambiguation). Arrow is an American action crime television series developed by writer/producers Greg Berlanti, Marc Guggenheim, and Andrew Kreisberg. It is based on the DC Comics character Green Arrow, a costumed crime-fighter created by Mort Weisinger and George Papp. It premiered in North America on The CW on October 10, 2012, with international broadcasting taking place in late 2012.