Confounding Variables 25

The LAST one for the year!! I can't complain. I only had to do one per week. AND I got lots of indirect compliments!

I didn't put a lot of thought into this one, really, because I have a lot coming up. Mainly finals, and two oral presentations. :/

Can't wait for the school year to be over! Then I can start my summer job. I look forward to it every year now.