The Moebius Strip

The Moebius Strip You’ve probably heard the expression, “There are two sides to everything”. But are there? You can find out by making this strip. Things you’ll need: several strips of paper 25cm long and 2cm wide, scissors, a pen, and tape. 1. To make the Moebius strip, you need to half-twist the strip of paper and tape the ends […]

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How to Make a Periscope

In 1854 Hippolyte Marié-Davy invented the first naval periscope, consisting of a vertical tube with two small mirrors fixed at each end at 45°. Simon Lake used periscopes in his submarines in 1902. A periscope works by using two mirrors to bounce light from one place to another. A typical periscope uses two mirrors at 45-degree angles to the direction one […]

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