>In article <[log in to unmask]>,
>  "mitchell miller" <[log in to unmask]> wrote:
> My son who is in the 4th grade needs to prepare a report  50 inventions
and
> their inventors who have done the most to change the world.
> Anyone who has any ideas on where to get this information and is willing
to
> share it with us please let us know.
> My son and I thank you!


This search should begin the Lemmelson Center for Invention and Innovation
(Name typed from memory, it is much longer and I may have switched words
around) at the Smithsonian's National Museum of American History.  Their url
is http://www.si.edu/lemelson/

It is a great site with great people who would be happy to help you.

Matthew White
Director of Education
B&O Railroad Museum