What was one reason close-ups were used in the video duck and cover?

Close-ups were used in the "Duck and Cover" video to emphasize the emotional reactions and expressions of the children as they learned about safety procedures during a nuclear threat. This technique helped to create a sense of urgency and seriousness about the issue, making the message more impactful. By focusing on the children's faces, the filmmakers aimed to convey both fear and reassurance, reinforcing the importance of the safety drills.