Singapore police have launched an investigation after a video of a man allegedly filming female students using smart glasses went viral, sparking concerns about privacy and safety.In the social media video, a man wearing black-rimmed glasses and a face mask is seen walking behind two female students wearing what appear to be uniforms from Raffles Institution, a premier school in the city state. The girls seem unaware of his presence.The man clutches his phone to his chest and presses what...