3 ms·They serve an important purpose: https://youtu.be/Fdjf4lMmiiI?t=9 https://youtu.be/Fdjf4lMmiiI?t=9by WalterSear 7y agoThey serve an important purpose: https://youtu.be/Fdjf4lMmiiI?t=9 https://youtu.be/Fdjf4lMmiiI?t=9