Twice Five Plus the Wings of a Bird

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Horizon
28th April 1986 1 hour Season 23 Episode 15

Horizon researches how we acquire mathematical abilities in the first place.

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What Makes an Animal Smart? still
Season 23 · Episode 16

What Makes an Animal Smart?

This report by Horizon takes a look at the instinctive side of intelligence in animals that shows us that we owe more to instinct than we may care to think.
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