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Photography by Bob Goldstein

ANIMAL DETECTOR

image A webcam captures animals who visit while you sleep.

By Bob Goldstein

My 4-year-old son comes up with some funny ideas. A few months ago, he asked for a piece of cheese to leave outside for animals. We gave him a slice of cheddar. The next morning he jumped out of bed and hurried to the window. The cheese was gone, but who had taken it? He was guessing all day. We looked for footprints or tiny hairs, but found no clues.

Then we got more ambitious. I knew that some webcam programs can record video only ...

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