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An introduction to how to make your own simple speaker, which transmits sound from a radio or MP3 player and demonstrates the principles of electromagnetism and vibration.

A detailed demonstration of how to make a cup speaker, including a discussion of materials needed.

The science behind the Cup Speaker activity, including how electromagnets work, and how in this activity the magnet pushes the bottom of a cup back and forth, vibrating the air and creating sound.

Our host, Stephanie Chasteen, shares some fun facts and activities having to do with the science of sound.

Learn how to build a version of a Brazilian instrument called the cuica, which demonstrates principles of sound. This podcast was created collaboratively in a teacher workshop at the Exploratorium.

Terje Isungset is one of Europe's most accomplished and innovative percussionists. With over two decades experience in jazz and Scandinavian music his work travels far beyond traditional boundaries. He's become more like a cross between a sound artist and a shaman. Isungset crafts his own instruments from natural elements found in Norway such as arctic birch, granite, slate, and even ice.

We speak with biologist David Ainley, who has been studying Adelie penguins in Antarctica for more than 25 years

Adelie Penguins bicker around their nests at Cape Royds, Ross Island, Antarctica.

Penguin adults tending their chicks at the colony

Shots of the research pen at the Cape Royds adelie penguin colony.