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Good Question: Why Are Colored Dots On San Francisco Storm Drains?

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(CBS)

(CBS)

SAN FRANCISCO (CBS 5) – There is plenty of unique sights on the streets of San Francisco, but these are right under your feet. In this Good Question: What are those colored dots on San Francisco’s sewer grates?

Our video report has more.

(Copyright 2011 by CBS San Francisco. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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