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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.

00:00:39
An introduction to the cuica (pronounced KWEE-kah), a small friction drum used in Brazil's Carnival parade.

00:06:39
A detailed demonstration of how to make this small friction drum, including a discussion of materials needed and how different kinds of materials make for cuicas that produce different sounds.

00:01:30
The science behind this musical instrument, including the concepts of sound, vibration, resonance, and amplification.

1:17:34
How do opera singers sing loud enough to be heard over an orchestra? Can an opera singer's voice really break a wine glass? What's the difference between a baritone and a soprano? Discover the answers to these questions—and more!—in this presentation for families. Join physicist and composer Dr. Brian Holmes and San Francisco Opera Center Director Sheri Greenawald to explore how the art and science of singing combine in opera.

00:53:00
A discussion about the artistic, scientific, and moral interpretations of J. Robert Oppenheimer and his legacy as the father of the atomic bomb. Composer John Adams and librettist Peter Sellars of the Doctor Atomic opera are joined by Richard Rhodes, author of the Pulitzer Prize-winning book, The Making of the Atomic Bomb. Kip Cranna, musical administrator at the San Francisco Opera, moderates.

00:60:00
A discussion about the artistic, scientific, and moral interpretations of J. Robert Oppenheimer and his legacy as the father of the atomic bomb. Composer John Adams and librettist Peter Sellars of the Doctor Atomic opera are joined by Richard Rhodes, author of the Pulitzer Prize-winning book, The Making of the Atomic Bomb. Kip Cranna, musical administrator at the San Francisco Opera, moderates.

1:13:04
Watch as Exploratorium staff and local teachers compete for the title of Iron Science Teacher. Each contestant has 10 minutes to make a science lesson out of a science ingredient. This is a Halloween edition of Iron Science Teacher, and today's secret ingredient is: Bones!

00:19:05
Join Exploratorium scientist Dr. Paul Doherty and Dr. Eric Wegryn as they discuss the rings of Saturn and show new images from Cassini.

00:55:27
Watch as Exploratorium staff and local teachers compete for the title of Iron Science Teacher. Each contestant has 10 minutes to make a science lesson out of a secret ingredient. In this special Halloween edition, today's secret ingredient is: Plastic Bags!