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00:02:16
The science behind the rocket and rocket launcher in the Bottle Blast Off activity, with troubleshooting tips for how to fine-tune the nose and fins of the rocket for better flight. Also includes tips on how to take the activity further by making a simple inclinometer to measure how far your rocket flies.

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.

00:00:40
An introduction to the stripped-down motor, a simple and easy-to-make version of the electric motors found in toys, tools, and appliances.

00:01:16
A detailed description of the simple materials needed to make a stripped-down motor.

00:02:48
A step-by-step demonstration of how to make the stand for the stripped-down motor.