Being on the cutting edge of technology isn't easy. There are long hours, grueling work, and all the expectations after you make a name for yourself -- not to mention the danger.
Some of the greatest inventions of the 19th and 20th century also called for the greatest sacrifice from their creators. Some of these inventions, like the propeller train, died alongside their inventors, while the rocket-propelled car has managed to lived on.
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13 Inventors You've Never Heard of
We recognize a few of the inventors who have lost their lives in the name of advanced technology. But that propeller train could probably make a comeback.
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