Kid President - How To Change The World with Kindness. Teaching kindness to children is part of the fourth National Health Education Standards: Students will demonstrate the ability to use interpersonal communications skills to enhance health and avoid or reduce health risks. Learning to be kind helps build a positive learning environment.
The stone-throwers took two forms-either like the arrow-firing apparatus or large one-armed catapults, known in the 4th century CE as the onager or 'Wild Ass' because of its terrific recoil but, in fact, first appearing in the 2nd century CE.
The oldest bows in China and Sub-Saharan Africa date from approximately 3000 years ago. The bow and arrow appeared in North America, roughly 2,500 years ago, it replaced the atlatl (spear thrower) and dart. The bow eventually spread to Mesoamerica by around 100 AD, and to South America by 300 AD.