If you ever wondered why it is so important to be exact in math, particularly in engineering math, then take a look at cases in which a math error resulted in deaths. Remember the Hyatt Regency disaster in Kansas City so...
https://www.neatorama.com/2012/01/10/6-small-math-errors-that-caused-huge-disasters/The Twist Bridge in Vlaardingen, the Netherlands, was built for bicycles and pedestrians to cross the canal, but it's also a work of art! Made of 400 steel tubes, the matrix that covers the bridge is eye-catching and...
https://www.neatorama.com/2011/12/03/the-twist-bridge/(YouTube link) German aquaculturist TCHelmut put a glass observation tower in his koi pond. The fish get a good view of their surroundings and people get a good view of the fish! There are more videos at his YouTube...
https://www.neatorama.com/2011/10/24/koi-observation-tower/
