Exploratorium left a tip at Hawk Hill

Conzelman Rd, Marin Headlands, CA | August 16, 2011
Bring your musical instrument and try some listening experiments! Or, grab sticks & rocks, and bang inside and outside the tunnel. What sounds do you notice? See more experiments at Hawk Hill Tunnel:
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Hawk Hill
Marin Headlands, CA
Scenic Lookout
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