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[SQUEAKING] [RUSTLING] [CLICKING] SARAH HEWETT: All right. Good afternoon. Today, we are going to start talking about a new lab, the Essential Oil lab. And if we look ahead a little bit in the semester, so we're still working on finishing up the Charles River lab. We have today, then we have day four on Wednesday and Thursday. And then next Monday and Tuesday will be day five of the Charles River lab, and that'll be your quiz day. And then after that, we're going to start a whole new set of labs. And the last three labs of the semester-- so there are five total labs-- we're going to rotate so not everybody is going to be doing the same lab at the same time. So each bay in each group with your TA, you'll be doing a different lab. So everybody will get a chance to do all three, but you'll just do them in a different order. So after the Charles River lab, the A prime 2 group, the closest to the middle of the lab, you'll be doing the essential oil ...

[SQUEAKING] [RUSTLING] [CLICKING] SARAH HEWETT: All right. I guess we can get started. So today, we're going to talk about what's significant in laboratory measurement and how to take measurements in the lab, how to do calculations with the lab, and how to do some of the data analysis when you have a lot of quantitative data, which you will have in the lab coming up when we do the Ellen Swallow Richards or the Charles River Lab. One thing I wanted to point out-- so there's hand-outs in the back. We're going to be going through how to do the calculations and how to do all the statistics. And there's an example problem that we're going to work through as we go in the back. So if you want to make sure you have a copy of that, that might be helpful. And one of the things that was pointed out this week in the lab is that in the lab, there is a typo left over from when we were in the old labs in Building 4. And so this Wednesday and Thursday, the TA sess...

[SQUEAKING] [RUSTLING] [CLICKING] SARAH HEWETT: All right, let's get started. And if anybody else shows up, then that'll be fine. So today, we are going to talk about how to write a lab report, which is a pretty important part of this course, since it's going to determine a good portion of your grade. And in general, it's good to know how to communicate the science that you do, whether it's in this class or in your research, or in any other context, really. So I wanted to start just by thinking about these two questions, which is why is it important to write up your results, and then how should you write a lab report? And to help get us thinking about these questions, I printed out on this handout that has a good chunk of text on it. The top part is Ira Remsen's account of his experiment with copper and nitric acid. If you have not read it before, it's a pretty good read. So if you could skim that. And then at the bottom, there is a shorter des...