Snell's Law & Index of Refraction - Wavelength, Frequency and Speed of Light

Uncrustamemes on Instagram: "South Korea is using advanced piezoelectric tiles to convert the everyday footsteps of people into clean electricity. As millions move through busy places like Seoul Station, Hongdae, and Myeongdong, the pressure from each step bends the tiles slightly, creating mechanical stress that the piezoelectric material transforms into electrical energy. This power is then used to run LED lights, smart sensors, and digital displays across public spaces, helping reduce the cou