Get Involvedpublished at 13:18 British Summer Time 16 July 2016
tms@bbc.co.uk
The cabbage leaf idea (12:27) may not be a complete windup. Transpiration (and evaporation) absorbs heat from the surrounding air, making it significantly cooler. Hence sitting under a tree is noticeably cooler than sitting under an umbrella. However, whether a single cabbage leaf transpires sufficiently to induce a notable cooling effect is questionable. A wet cabbage leaf would certainly be better....
John Davidson