Expats and tourists from the United States come to Costa Rica with a handicap. While most of the rest of the world, including Costa Rica, is using the metric system, the U.S., despite several efforts ...

In the supermarket, on the street and in bars, Europeans have long thought in units of 10 — fruit is weighed by the kilo, beverages dispensed by fractions of a liter and distances marked off in meters ...

Add Yahoo as a preferred source to see more of our stories on Google. When Sally Mitchell, a science teacher at East Syracuse Minoa Central High in Syracuse, New York, spoke to a group of students at ...