![](https://www.interez.sk/wp-content/uploads/2019/10/charles_f-_kettering.jpg?x56282)
Charles F. Kettering. Foto: [Public domain], via Wikimedia Commons
![](https://www.interez.sk/wp-content/uploads/2019/10/thomas_midgley_jr.jpg?x56282)
Thomas Midgley. Foto: [Public domain], via Wikimedia Commons
![](https://www.interez.sk/wp-content/uploads/2019/10/900px-zirconium-pieces.jpg?x56282)
Kúsky zirkónu. Foto: Jurii [CC BY 3.0], via Wikimedia Commons
![](https://www.interez.sk/wp-content/uploads/2019/10/canyon-diablo-meteorite.jpg?x56282)
Meteorit Canyon Diablo. Foto: Geoffrey Notkin, Aerolite Meteorites of TucsonGeoking42 at en.wikipedia [CC BY-SA 2.5], via Wikimedia Commons
![](https://www.interez.sk/wp-content/uploads/2019/10/a_piece_of_lead.jpg?x56282)
Olovo. Foto: Hi-Res Images ofChemical Elements [CC BY 3.0], via Wikimedia Commons
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Reklama propagujúca výrobky na báze olova. Foto: flickr.com (Boston Public Library)
![](https://www.interez.sk/wp-content/uploads/2019/10/1199px-edmund_muskie_ca-_1987.jpg?x56282)
Edmund Muskie. Foto: Kenneth C. Zirkel [CC BY-SA 4.0], via Wikimedia Commons
![](https://www.interez.sk/wp-content/uploads/2019/10/apache_vintage_car_retro_classic_old_vehicle_auto-1401424.jpg?x56282)
Foto: PxHere
![](https://www.interez.sk/wp-content/uploads/2019/10/10-41-77.jpg?x56282)
Clair Cameron Patterson. Foto: S láskavým dovolením od Caltech Archives