The summer has arrived and unfortunately whilst the plants seem to think this is excellent. It is making life difficult for the web cams. After attempting to do this in software it would appear that the range of bright light is just too much. So an initial first attempt at resolving this problem has been [...]

The quick answer is : CONTROL + U
(This is because F2 will cut the contents of a cell)
However if you want the complete list, open Help -> Excel Help and then type “excel keyboard shortcuts”
There is great article on this subject buy Rob Griffiths of MacWorld :
http://www.macworld.com/article/134549/2008/07/exceleditcell.html