new explain_ on Instagram: "This metal demonstration shows an incredible concept called “zero tolerance” engineering. The metal piece is precision-machined along a line so perfectly that when it’s split by hand and pressed back together, the edges appear to disappear. It’s not magic or self-healing — the secret lies in extreme manufacturing precision and sometimes slightly malleable metal or hidden magnets that help the halves align flawlessly. “Zero tolerance” here means the gap between the edg

Understanding Different Tolerances in Materials