# 
# On Sun, 8 Jul 2001, Avi Bryant wrote:
# 
# > class Numeric
# > 	def mm
# > 		Millimeters.new(self)
# > 	end
# > 	def cm
# > 		Centimeters.new(self)
# > 	end
# > 	...
# > end
# 
# Although actually it should be
# 
# class Numeric
# 	def mm
# 		Meters.new(self / 1000.0)
# 	end
# 	def cm
# 		Meter.new(self / 100.0)
# 	end
# 	...
# end
# 
# Avi
# 

You see it's not as simple as it seems :)))))))))))))