Terrifying History on Instagram: "On September 1, 1859, British astronomer Richard Carrington observed an unusually large solar flare, the first ever recorded. This was the precursor to what is now known as the Carrington Event, the most powerful geomagnetic storm in recorded history. The coronal mass ejection (CME) associated with the flare reached Earth in approximately 17 hours, rather than the usual three or four days, on September 2. The resulting geomagnetic storm was so intense that brill

How Everything Is Made on Instagram: "In the 1930s, a few pioneering builders experimented with houses constructed by machines that poured concrete in continuous, layered forms — functioning almost like an early precursor to modern 3D printing. Instead of stacking bricks or erecting wooden frames, these systems used slip-form or contour-crafting–style rigs that traveled along rails, shaping walls directly on-site as they deposited wet concrete. This technique made it possible to create flowing c

Encyclopedia-Excel on Instagram: "The device that built bridges, planes, and rockets before calculators 📏 #sliderule #math #engineering"