.Hi,
There are many articles on wikipedia that contain different units. Some use cm, that are common in europe, other use inches that are more widely used in US, same with other unit types.
I think it would be cool if an extension was created which would allow everyone to specify what units they prefer, and the values in articles would be converted automatically based on preference.
For example you would say the object has width of {{unit|cm=20}} and people who prefer cm would see 20 cm in article text, but people who prefer inches would see 7.87 inch. This could be even based on geolocation for IP users
What do you think?