Practical Machinist on Instagram: "Time to ditch the analog refractometer! @rebecca.wolfinger shows how to calibrate your digital refractometer, measure the Brix and calculate your coolant concentration using the refractive index. Quick, accurate and no more guessing."

Explainer Zone™ on Instagram: "This video is a perfect reminder of how the term “horsepower”—a unit we use casually when talking about cars—originated from the real, raw strength of actual horses. One horsepower was defined by engineer James Watt in the 18th century as the power needed for a horse to pull around 180 kg with steady force, equivalent to 746 watts of energy. But the horses shown here are not ordinary riding horses—they’re draft horses, specially bred for strength, capable of pullin