★ İntellektualElm33:45Why It Was Almost Impossible to Make the Blue LED30 avqust 202452,0 mlnVeritasiumElm
★ İntellektualElmHow Trains Changed the World - The Epic Story of Railways29 avqust 2026Progress - Science DocumentariesElm
★ İntellektualElmThe Incredible Evolution of High Speed Trains and Rail Power23 avqust 2026Progress - Science DocumentariesElm
★ İntellektualDigərwhy does an ambulance sound different once it passes you? 🚑14 avqust 2026StarTalkDigər