Antenne (File:IEC_Antenna.svg) by ErikBuer (https://commons.wikimedia.org/w/index.php?title=User:ErikBuer&action=edit&redlink=1) via CC BY-SA-4.0 (https://creativecommons
(https://commons.wikimedia.org/w/index.php?title=User:Spiffistan&action=edit&redlink=1) via Release into public domain 19. Haemoglobin (File:Haemoglobin-3D-ribbons