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Why kissing is really all about...sniffing!
Evolutionary Anthropologist Dr Anna Machin explains to Simon why humans kiss.
Duration:
More clips from Simon Mayo Drivetime
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Davina McCall offers Amol some parenting advice
Duration: 01:40
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Focus鈥� Thijs van Leer yodels for Simon!
Duration: 02:02
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How did Robert Webb work his magic on JK Rowling?
Duration: 01:18
