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.
A catapult is a type of machine used as a weapon to throw rocks or other things such as hot tar, that would cause damage to something else. Often, catapults were set on higher ground or on castle towers to let them shoot farther. They shot rocks to break castle walls, or pitch or hot tar to set the target on fire. Catapults use weights and levers to send the rocks or other things into the air. They do not throw as far as modern weapons do, and are not useful in modern warfare. Catapults were common in the past, especially the Middle Ages. Nowadays catapults are used to study old weapons, and as experiments (for example in physics or engineering classes).