Pubity on Instagram: "😲 Oxygen can look shiny underwater because tiny bubbles bend and reflect light much more strongly than the surrounding water, creating bright, mirror-like surfaces. The smooth bubble walls act like miniature lenses that catch light and send it back to your eyes, so even a small cluster can appear silvery. This effect is especially noticeable when bubbles rise quickly or gather on surfaces, making the oxygen seem to sparkle underwater. (@norinsmarine via ViralHog) #surprise

🚒💦 Why Do Firefighters “Waste” Water by Opening Hydrants? It looks like they’re wasting water — but it’s actually a critical safety check. When firefighters open hydrants and let water gush out, it’s called “flushing the hydrant” and it serves important purposes: ✅ Clears out sediment & rust from pipes that could clog hoses ✅ Ensures hydrant pressure is stable before an emergency ✅ Confirms the water supply is clean, strong, and ready ✅ Helps identify leaks, faulty valves, or low-pressure zone