0:32 play_arrow Burning of magnesium ribbon Wonder world visibility 4 schedule πριν 1 χρόνια favorite
0:26 play_arrow Electric conductivity of graphite Wonder world visibility 1 schedule πριν 1 χρόνια favorite
0:33 play_arrow Simple demonstration of electric motor working principle Wonder world visibility 3 schedule πριν 1 χρόνια favorite