Comment faire une bougie avec du sable magique

SCIENCE | HISTORY | FACTS | EXPERIMENT on Instagram: "The Netherlands has mastered a smart waste system that keeps streets clean, odor-free, and visually beautiful — by moving trash below ground. This video shows how underground waste container systems work and why they’re changing modern cities. 🔹 Underground Containers: Instead of bins on sidewalks, waste is stored in large sealed containers buried beneath the street. Only a small inlet is visible above ground. 🔹 More Capacity: One undergrou