A Home Team Science and Technology Agency (HTX) autonomous robot Xavier patrols the high foot traffic area in Singapore's Toa Payoh Central on September 6, 2021. For a three-week period from Sept. 5, 2021, autonomous robot Xavier will weave its way through the crowds in Toa Payoh Central of Singapore to detect the undesirable social behaviors like smoking in prohibited areas and congregating of more than 5 persons. (Photo by Then Chih Wey/Xinhua News Agency)
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