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 firearm was originally invented in China during the 13th century AD, after the Chinese invented gunpowder during the 9th century AD. These inventions were later transmitted to the Middle East, Africa, and Europe. The world's first firearm in history was the fire lance, the prototype of the gun.The fire lance was invented in China during the 10th century and it is the predecessor of all firearms.The phalanx-charging fire-gourd, one of many fire lance types discharging lead pellets in the gunpowder blast, an illustration from the Huolongjing, 1260.he fire lance was invented in China during the 10th century and it is the predecessor of all firearms. The phalanx-charging fire-gourd, one of many fire lance types discharging lead pellets in the gunpowder blast, an illustration from the Huolongjing, 1260.