Do you intend to do further research on your topic once you've gotten a job coming out of grad school? Make notes of points you definitely want to share with your committee.
Take a moment to pause before you give your answer if you need to - they are not looking for quick responses, but they are looking for solid ones.
Sure, there is a big difference between talking to high school students and presenting at a conference, but try to think: who is coming to my talk? You need to describe the importance of your topic and detail how your research was conducted, including any methods of measurement you have used.
You've been warned; prepare for it. Test the equipment before your presentation.
Pay close attention to your advisor's reactions to your thesis and heed any advice they give you - he or she has heard many defenses and knows what committees look for.
A lot of valuable information about the thesis writing process, information that could be shared from one year to the next, just gets discarded at the start of the summer. I like a formal practice talk the week, and two weeks before the talk.
Excel can be your friend but if you use the default graph settings it will be your downfall. At the same time, your thesis committee members will likely know your field in a much broader sense than you.
The same holds true with graphs in Excel versus Origin. Keep a grammar log requirement in their back ground and could use to receive occasional rejection slips even after the last consonant and add examples and details for a sensuous reading experience.