EXPLO.TV - Webcasts, Video Clips, and Podcasts from the Exploratorium

Science in the City: Camera Obscura (clip)

Running Time:
00:04:05

On the cliffs above San Francisco's Ocean Beach perches a landmark observatory—a giant camera obscura. Step inside with Robert Tacchetto and see how this centuries-old technology creates enchanting images of the outside world.

Project: Science in the City | Browse All

Date: July 11, 2012
Format: Expedition
Category: Everyday Science
Subject(s): General Science

Science in the City: Black Sand (clip)

Running Time:
00:03:53

Join Exploratorium educator Ken Finn as he unlocks the mystery behind the black sand (a.k.a. magnetite) at Ocean Beach. This piece explores the origin of magnetite in the Sierra Nevada mountains, its journey down the Sacramento and San Joaquin rivers to the Bay, and the interesting physical properties of this mineral, plus some fun things you can do with it.

Project: Science in the City | Browse All

Date: August 9, 2011
Format: Expedition
Category: Everyday Science
Subject(s): General Science