Double-sided photocopying makes you happy

Haven't posted for a few days because I've been spending all my time in the lab running participants for my research project. I'm looking at the relationship between music and problem-solving ability, and participants have to listen to some music and then do some paper-based problem-solving tasks involving diagrams of paper being folded and bits cut out of them. To save paper, and energy photocopying, I've put all the questions into a booklet that can be re-used for each participant! The pages in the booklet are also double-sided, halving the number of bits of paper needed. Wonderful. Then participants just give their answers on a separate answersheet thats only one page long. Doing this will have saved about 300 photocopies. Thats probably half a forest (forests, incidentally, absorb lots of CO2), and lots of electricity from photocopying, saved. That made me very happy. Photocopying only when you absolutely need to, doing it double-sided and using recycled paper will make you happy too.