Armstrong invented profoundly important technologies that advanced our
understanding of radio.
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+<indexterm><primary>Bell, Alexander Graham</primary></indexterm>
+<indexterm><primary>Edison, Thomas</primary></indexterm>
<indexterm><primary>Faraday, Michael</primary></indexterm>
</para>
<para>
glass, and thus it was still not a process within reach of most
amateurs.
</para>
+<indexterm id="idxeastmangeorge" class='startofrange'>
+ <primary>Eastman, George</primary>
+</indexterm>
<para>
The technological change that made mass photography possible
didn't happen until 1888, and was the creation of a single man. George
doing something with media. By doing, they think. By tinkering, they
learn.
</para>
+<indexterm startref="idxeastmangeorge" class='endofrange'/>
<para>
These buses are not cheap, but the technology they carry is
increasingly so. The cost of a high-quality digital video system has