The Zoo has been following the work of the Zoological Society of London and this evening it looks at the ground-breaking work being done at the Bedfordshire attraction involving chimps and heart surgeons.
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There'll be some dense patches of mist and fog about first thing this morning but it will clear later. Then, a cloudy but mostly dry day.
It will be a bright start in places but the cloud will thicken from the north during the afternoon and there'll be a few spots of rain.
Students at the University of Cambridge have raised money for charity by producing their own naked calendar.