Harry Boxer is author of TheTechTrader.com, a real-time diary of day and swing trades and technical market analysis.

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Vanderkam points out that surveys in which people are asked to recall how much time they spent on certain activities usually get different results compared to experiments that ask people to keep a time diary.

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It is the first time original pages of the diary that Livingstone wrote in 1871 will be on show to the public.

BBC: Events mark birth date of explorer Dr David Livingstone