My suspicion is, at the end of the day, because darkly-pigmented humans can still sunburn like crazy, melanin is not like a roof over your head. So it only has a certain amount of efficacy, so I'm not shocked that the increase was modest.

David Fisher

David Fisher is a British professional writer for television. He was born in 1929. He wrote the scripts for four serials of Doctor Who. He first contributed The Stones of Blood and The Androids of Tara during that show's sixteenth season, and The Creature from the Pit for the seventeenth season. He was also working on a story called "A Gamble with Time," also for the seventeenth season, but was unable to finish the scripts due to his divorce proceedings from his first wife. That story was reworked and completed by then script editor Douglas Adams and then producer Graham Williams, and was recorded and broadcast as City of Death under the pseudonym of David Agnew. His final Doctor Who story was season eighteen's The Leisure Hive. He novelised both The Leisure Hive and Creature from the Pit for the Target book range of Doctor Who novelisations, and appeared extensively on the interview features accompanying the DVD release of the former story. He was also interviewed for a documentary accompanying the DVD release of City of Death.

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