Now you have a speech to prepare the issue is where do you start? Do you immediately start your research on great scientists or do you research the way to write a great speech first? Great scientists is a very broad subject and unless you need your listeners trying to work out the atomic structure of the DNA in a Bengal tiger, it isn't a wise idea to put nuclear-physicists, geneticists and zoologists all in one speech, so I would definitely perform a little research on speeches at first.
Here are 5 interesting speech topics that can be used for great scientists but if none of these get your creative juices to flow you can find a whole lot more speech topics in the Web.
1) What does it take to become a great scientist?
For this subject you can discuss how many years of school it takes to become classified as a scientist and what degrees are required. Find out what schools are most fitted for scientific studies both here and abroad.
2) Are very good scientists born that way?
This subject would rely on the concept that some individuals are just "born" smart. You might focus on the level of intelligence of some famous scientist like George Beadle or Paul Berg. Learn if they did well in school or maybe if they were in programs such as MENSA.
3) Do Scientists believe in a higher power?
Many people accept that scientists don't believe in any God or higher power but with a little research you will find that many did. Just pick two that did and concentrate on their principles.
4) Weird facts about some of the best scientists.
Everybody wants to learn new things particularly out of a lecture and oddly enough, weird facts are generally what folk remember. For example, you can make it clear that Isaac Newton was so early they didn't expect him to live or that Alfred Nobel invented dynamite.
5) Accidental inventions by the greatest scientists.
There are many of these but an ideal example would be how Percy Spencer invented the microwave from a bar of choccie in his pocket.
Once you have found enough interesting speech topics that you can select from it is time to work on the composition of the speech.
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Don't worry about that either, AboutTopics.com has lots of articles and guidelines to help you with speech ideas too. There are a lot more good speech topics in the web, just follow the link and pick anything you like.