What about TIME: Could we please have a year equalling 1000 days with 10 months of a 100 days and a week of 10 days. The World wasn't built for metric units but for aesthetics where a pint of beer looks and feels right and is what an average person wants to consume in any one session. The same applies to weights: a pound of anything is much more to the human scale than kilograms etc. Packing is another problem much easier to pack a dozen items (3x4 or 2x6) than 10. And why isn't the World a perfect circle rather than an oblate ellipse? In the World of computers it's binary so 1s and 0s and thus bits, bytes hexadecimal octal .....