On February 2nd, 2021, the 2021 Queen Elizabeth Prize for Engineering (QEPrize) was provided to 5 engineers who ended up vital on the creation and ensuing growth of what would turn out to be the keystone of good-state lights know-how: LEDs.Spalna susedi so stenou obyvacky tam kde je krb tak mozno to vyuzijeme a dame do spalne hypokaust a bolo by ta