How Things Look on Instagram: "When a nuclear reactor is powered on for the very first time, the moment is both historic and intensely controlled. Engineers monitor every reading as the reactor begins its slow climb toward criticality, the point at which a self-sustaining chain reaction forms. What looks calm on the outside is actually a precise dance of physics and engineering, with specialists ready to adjust control rods and coolant flow to keep the reaction perfectly balanced. As the reactor

Explainer Zone™ on Instagram: "This video shows a vintage pen plotter, a type of early computer-controlled drawing machine widely used from the 1970s to early 1990s for technical drafting, engineering diagrams, maps, and typography. Unlike modern printers that spray ink, a pen plotter physically moves an actual pen across the paper using precision motors and coordinate commands. These machines were known for producing extremely accurate straight lines and curves, which made them essential for ar