Detailed Explanation on Instagram: "Follow @detailedexplanation to learn something new every day! 🧠 When you raise your arms, the veins in your hands and arms have to work against gravity to return blood to the heart. Unlike arteries, veins don’t have strong muscular walls to push blood forward, so they rely on a combination of valves and external forces. Tiny one-way valves inside the veins stop blood from flowing backward, while the contraction of nearby muscles squeezes the veins and helps p

Detailed Explanation on Instagram: "A Prince Rupert’s Drop is a teardrop-shaped piece of glass formed by dripping molten glass into cold water, which rapidly hardens the outside while the inside cools more slowly. This process traps intense internal stresses that give the drop its bizarre properties: the thick, rounded head becomes incredibly tough. Able to survive hammer blows, while the long, thin tail remains extremely delicate. If the tail is cracked or even lightly chipped, the entire drop