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I made a calculator using only marbles

Watch me create a calculator from marbles! Why Elon Musk says saving for retirement will be 'irrelevant' in the next 20 years ...
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Why is it difficult to create a calculator app, and what are the innovations behind Android's 'Calculator'?

Smartphones and PCs are equipped with calculator apps, which allow you to instantly find the answer for simple calculations. However, it is very difficult to develop a calculator that can display ...