Delia Smith

Although a food processor is not an absolutely essential piece of equipment, because you can certainly chop, grate, slice, knead and mix everything by hand, it does do all these things very quickly and efficiently and saves you time and energy.

There are people who claim to be instinctive cooks, who never follow recipes or weigh anything at all. All I can say is they're not very fussy about what they eat. For me, cooking is an exact art and not some casual game.

Between 1939 and 1945 you produced weapons and war equipment valued at thirteen billion dollars, 70 per cent of which you shipped to your allies. The same process is going on today in Canada's much larger and growing industry.

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.