Page 141 - Key to Social Studies 4
P. 141
Another invention that caused
businesses to grow signi cantly was the
light bulb. In 1879, Thomas Edison invented
the rst electric light bulb. This invention, 3
years later, expanded to help in building a
power station that could power a whole
city.
Let’s Research!
Divide yourselves into groups, where each group should develop an idea of
an invention that would solve a certain problem. Present and explain the
impact of your inventions to the whole class.
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