UCLA students in one class had to take their final exam during the campus-wide lockdown that had many other students cowering in classrooms amid reports of a gunman stalking the school.

An NYU professor living in Shanghai said that his family is turning into "hunter-gatherers" while attempting to survive the city's COVID-19 total lockdown without starving.

Amanda Nickerson examines the effectiveness of these drills and how they impact children's preparedness, anxiety and sense of safety.