Updatey update of updatable type stuffs

Can I just start this off by saying you guys rock? Really. Thank you everyone who jumped in to help my daughter with her homework. Part of the issue with the question is not only is the book on the older side, but her school is based out of a major city 130km away. Most of the other children are "city kids" where I am told some stores do still have the option of something other than plastic or fabric bags. Learn something every day!

Also, because I am a dork, I found the responses fascinating.

And speaking of being a dork ...

Positron Emission Tomography (PET) scan! Check this out:


( Tracers! Radioactive Tracers! )