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00:15:41
Dr. Christine Carter is a sociologist who studies the childhood roots of happiness. She is the executive director of the Greater Good Science Center at UC Berkeley, an interdisciplinary research center that promotes the study of happiness, compassion, and altruism. In this program, Dr. Carter speaks about happiness, altruism, and the inspiring intersection of her personal and professional worlds.

00:00:31
An introduction to the bee hummer, a simple musical instrument that sounds like a swarm of buzzing bees when you spin it around.

00:06:08
A detailed demonstration of how to make the bee hummer, including a discussion of materials needed, troubleshooting tips if your hummer isn't humming well, and a demonstration of how the instrument should be played.

00:01:27
The science behind this simple musical instrument, including the concepts of sound, vibration, and amplification.

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.

00:00:24
An introduction to a crowd-pleasing noisemaker called a sound sandwich, which you can adjust to raise or lower its pitch.

00:02:32
A detailed demonstration of how to make this primitive wind instrument using little more than a straw, two craft sticks, and some rubber bands.

00:01:48
The science behind this instrument, including a discussion of how vibration produces sound, and how long, massive objects vibrate slowly and produce a low-pitched sound, while shorter, less massive objects vibrate quickly and produce a high-pitched sound.