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What Magnets Do
A compass needle points North because the Earth has a magnetic force that attracts the metal in the needle. Bob Symes shows what happens to the compass needle if a wire with an electric current is placed next to the compass. He proves that this princ...(more details) |
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How Batteries Work
Although batteries may look complicated, they are as simple as lemons. Bob Symes uses this fruit as the source of electrolytes-a basic component of all batteries. He attaches two dissimilar metal rods (one zinc, one copper) to a lemon and then measur...(more details) |
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Exploring the Cosmos
 This program features Freeman Dyson, an elder statesman of the scientific community whose ideas are so original in scope that his colleagues coined the term "Dysonian" to describe any highly imaginative idea. Joining him are astrophysicist Sara Seaga...(more details) |
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$169.95 |
| DVD + 3-Year Streaming |
$254.93 |
| 3-Year Streaming |
$169.95 |
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How a Photograph Is Made
Using everyday examples (such as sunburn) and demonstrations with ordinary materials, Bob Symes explains the principle of photosensitivity. He points out the different reactions substances have to light, and then continues with a discussion of chemic...(more details) |
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