How do motion sensing lights and burglar alarms work?

How can motion-sensing lights detect your presence, and what prevents them from seeing you when you're standing still? It all comes down to the movement of light.

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Original Article Source Credits: howstuffworks, https://home.howstuffworks.com

Article Written By: NA

Original Article Posted on: NA

Link to Original Article: https://home.howstuffworks.com/home-improvement/household-safety/question238.htm