The pupillary distance (PD) measurement is a requirement for people who want to purchase eyeglasses. Here, find out how to measure your PD using a mirror and a ruler. Share on Pinterest Some eyewear ...

All Debra Monck wanted was a tool that would help her students learn the difficult subject of measuring. Conventional rulers just didn’t work, the Pohatcong Township, N.J., woman had learned during ...

Since the scale line of a general ruler has a width, many people have had the experience of trying to draw a line of the correct length with a ruler and wondering 'how far should I draw this scale ...

What you need: ruler, protractor, pencil and paper. Use these to construct a triangle when you know the length of 1 side and the 2 angles at each end of it. In this case use the length 8 cm, and the ...

Admit it, the iPhone in your pocket is like a Swiss Army Knife - it’s easy to carry and has a tool for almost every job; oh yeah, and it makes phone calls too. A ruler isn’t something you need all the ...

Size Matters: Measuring distances between molecules is no simple task, but a team of German researchers has developed a new method that could revolutionize biological research and possibly even impact ...