Instant Genius is a bite-sized masterclass in podcast form. In this week's episode, we talk to Adam Hart, an entomologist and professor from the University of Gloucester.

He explains the reasons that we start to notice so many spiders at this time of the year in the UK, and whether spiders are actually any harm to us.

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Alice Lipscombe-SouthwellManaging editor, BBC Science Focus

Alice is the managing editor at BBC Science Focus Magazine. She has a BSc in zoology with marine zoology. Her interests include natural history, wildlife, the outdoors, health and fitness.