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60 Harvests and statistically savvy parrots
A listener asks if there can really only be 60 harvests left in Earth's soil. Are we heading for an agricultural Armageddon? Plus we meet the parrots who are the first animals, outside humans and great apes, to be shown to understand probability.
(image: Kea parrots in New Zealand)
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Tim Harford explains the numbers and statistics used in everyday life.
