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These buttons are probably made of a hard plastic. Silicon plastic or non-degradeable rubber would be on most calculators because then it will stay the same shape but, will also not just come out.
Silicon was discovered by a Swedish chemist called Jons Jakob Berzelius in 1824. He lived from 1779 - 1848 and discovered silicon and another material called selenium.game-solver.com
This lid is made of a hard non-shattering plastic. It is made of this because otherwise if you drop it it would shatter.
Calculators were invented in either 2000 B.C. - if an abacus counts as a calculator - or the 1960's. Its model nowadays was designed in the 1990's.ecx.images-amazon.com
These screws are made of stainless steel so that they will hold fast and not rust.
These are very small screws but, they come in all different sizes so that you can make a number of different objects with screws. They were invented in 1770 in England by a instrument (musical) maker called Jesse Ramsden.www.mackay.co.uk
This is a long piece of rubber to be put behind the buttons of a calculator or T.V. remote to make sure they do not fall into the object.
There is a whole range of rubbery and bendy calculators (as shown in the image) for children so that if they drop it or it bends in their pocket it will probably not break.i00.i.aliimg.com
These are copper wires on the inside but, are plastic on the outside. They use copper as the inside because it is a good conductor (for taking in energy) and plastic because it is a good insulator (for getting rid of energy).
Wires are used in lots of things including: aeroplanes, lights and drills by taking electricity through the wires into the part that does the work.<br>assets.inhabitat.com