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Many tall buildings use steel beams in construction.
Many times they use beams called I beam. Cross section of an I beam
   has a shape of the letter I.
The following experiment will let you learn why they use I beams.
Important: Please make sure you get help from an adult and use all protective
gear such as eye guards, hand gloves etc.
Aim: In the following experiment you need help from an adult to try to walk
on your own over a single beam.
You Need: Two bricks,

                      Three to five 2x4 wood planks

 

                      Nails  and                               A hammer.

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