The oldest human footprint was found on Calvert Island, Canada in March. The footprints might be older than 13,000 years and belonged to three people – a child and two others who may have been adults. The footprints managed to stay visible because at that time the three humans stepped on wet clay that hardened and filled with sand. Archaeologist also found a small piece of wood along with the footprints which allowed them to run radiocarbon dating on the prints, which then revealed their footprints dated back between 13,300 and 13,000 years ago.