How useful is the information you get from the measure of any thing? That depends on what you chose measure in the first place, and that's not always clear.
The international prototype kilogram keeps changing weight so scientists have come up with a new way to calculate.
Most researchers use the UN's Human Development Index to measure each country's progress, but that system has flaws. A new, simplified index aims to do it better.
Economists, politicians and the media watch GDP closely. But it isn't the best way to measure the health of the US economy.
Driverless cars and drones will require pinpoint location accuracy, which means our methods for measuring the Earth's centre need an overhaul.
The Australian Census has been taken since 1911. But is it still necessary in today's world of mass digital data collection?
For a long time the way we measure what is going on in our economy and society has distorted our actions. We're now building a more holistic way of measuring progress.
If you're into business and finance there are myriad numbers you can look at. But PMI is one of the better ones if you really want to know where an economy is going.
It's really hard to measure snowfall accurately. The National Weather Service relies on more than 8,000 volunteers with rulers.