On February 2nd, 2021, the 2021 Queen Elizabeth Prize for Engineering (QEPrize) was given to 5 engineers who were critical into the creation and ensuing progress of what would turn into the keystone of good-state lights engineering: LEDs.Spalna susedi so stenou obyvacky tam kde je krb tak mozno to vyuzijeme a dame do spalne hypokaust a bolo by tam