More sense

The list of "sensible" units that will convert to has, with help from my endearingly geek-tolerant girlfriend, been considerably expanded.

Any input with a magnitude equivalent to a distance between 0.1 mm and 10 million km will now produce at least one result, and there are even some values outside that range that will work too.

There may be some debate over whether "five month old human fetuses end to end" can really be counted as a sensible unit, or if such a unit is an ethical basis of measurement, but I won't change anything until the complaints and abuse begin to hamper the efficiency of my work.