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5/5 Neurologist Susan Greenfield looks into the life of Nobel Laureate Rita Levi-Montalcini.
4/5 Barry Marshall goes in search of John Hunter, a zealous 17th-century surgeon.
3/5 Prof Hugh Pennington looks back at the life of Joseph Lister.
2/5 Paul Davies looks back on the life of fellow scientific populariser Carl Sagan.
1/5 Susan Blackmore explores the connection between herself and LSD pioneer Albert Hofmann.