Explaining The Universe on Instagram: "Follow (us) @ExplainingTheUniverse to learn something NEW every day 🧠💫 A dam is a barrier built across a river or stream to control the flow of water. By holding back water, dams create reservoirs that can be used for drinking water, irrigation, hydroelectric power generation, flood control, and recreation. There are several types—such as gravity dams (which rely on their weight to resist water pressure), arch dams (curved, transferring force into the val

History | Ancient History on Instagram: "The chains used on enslaved people were instruments of both physical restraint and psychological domination, designed to strip human beings of autonomy and reduce them to property in the eyes of their captors. Made of iron and often crudely forged, these chains came in many forms—heavy shackles for the ankles, iron collars connected by bars or rings, and manacles that bound wrists tightly together, sometimes joined by a central chain to prevent escape or