Space-Time Continuum

Hello,

I'm currently doing a research assignment on the space-time continuum
and was wondering if anyone here would be able to help me with it.
Information seems to be easy enough to find via Google and newsgroups,
but I'm not sure on what to include for a basic assignment of the
space-time continuum. I've tried to plan the assignment out, but I
constantly feel as if I've left something out. The current plan consists
of an introduction, the history and development of space-time theory,
current theory/research, and a conclusion. However these seem too broad,
because during my research several topics keep coming up such as
curvature of time-space, quantum physics, relativity and time travel and
am not sure how to go about creating an easy to read, yet scientific
report on this. The target audience is "9th-10th graders".