"Max Demian" wrote in message
o.uk...
3*10^8 isn't all that 'rational' as it has a 3 in it. Why not redefine the
foot so that c is 10^9 ft/s?

Because the foot is a "toy" folk unit as opposed to a serious scientific
unit ;-)

Let's define pi=3 and e=3 while we're at it ;-)