I have to do an explanatory speech. i have to choose a discovery or innovation that people know the general idea about but don't know anything beyond that.

does anyone have any ideas? Just as an example of the type of speech im looking for you could do : Counterfeit money(and how to tell if it is counterfeit)

2 answers

Whenever the story of how Edison invented the light bulb is told in history books, it's always very short and sweet. The back story is nearly never told!!

Read, read, read ...
http://www.google.com/search?q=the+story+behind+edison%27s+light+bulb&oq=the+story+behind+edison%27s+light+bulb&aqs=chrome..69i57j69i64.11006j0j7&sourceid=chrome&espv=210&es_sm=119&ie=UTF-8
Same with Hershey ... and his incredible success with chocolate!

http://www.google.com/#q=hershey+failures+before+chocolate+