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How do binoculars work?

22 May, 2020
Binoculars belonging to a Congressional Medal of Honor winner © Minnesota Historical Society (Flickr) What are Binoculars? Binoculars are, in essence, two telescopes mounted side by side in a hand-held device. However, unlike telescopes, binoculars are designed to be views…

How many hours are in a year?

22 May, 2020
© jakeandlindsay (Flickr) Calculator © jakeandlindsay (Flickr) Number of hours in a day, and number of days in a year Hours in a dayMost people know that there are 24 hours in a day. This is the simple bit of…

How many miles are in 5k?

22 May, 2020
© .shock young man ready for run on the start position ready to run © .shock Why should you want to know? There are all sorts of reasons for wanting to convert miles to kilometres, but here are the commonest…

How much does one gallon of water weigh?

22 May, 2020
© gothick_matt (Flickr) Gallons © gothick_matt (Flickr) History of a gallon A gallon is a measure of volume, equating to either 3.79L or 4.55L depending on its usage.The imperial (UK) gallon is equal to 4.546 L. It was made obsolete…

How many centimetres are in a metre?

22 May, 2020
© Sergey yellow ruler isolated on white © Sergey Introducing the metric system Before metric measurements were introduced, the length of something was measured using the imperial system which included feet, inches, miles, furlongs and others. The lack of common…