Meet Jo Nagai: 10-year-old Japanese student who discovered butterflies can remember their time as caterpillars after he noticed that the caterpillars he had raised to recognise him after turning into butterflies

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3. Meet Jo Nagai: 10-year-old Japanese student who discovered butterflies can remember their time as caterpillars after he noticed that the caterpillars he had raised to recognise him after turning into butterflies