> Many of us just prefer the customary units for many everyday uses for various reasons. The switch wasn't effective because there wasn't a concerted effort to

> Many of us just prefer the customary units for many everyday uses for various reasons. The switch wasn't effective because there wasn't a concerted effort to to make people switch by the government. They could have easily made it such that weather reports use Celsius in addition to Fahrenheit, speedometers in cars display speed in kilometers per hour by default, etc. Right now, we have a mix because certain products started using metric on their own (e.g., soft drinks with their 2 liter bottles, car manufacturers using liters to measure engine displacement instead of cubic inches, etc.).