<human>: Can you succinctly summarize the text in 1-3 sentences?

I'm a third year Biology student at a British university. I'm just coming up to the end of my final-year research project.

I'm studying how bacteria evolve when they have genes knocked out. I specialise in evolutionary biology, so I don't have much experience with basic molecular techniques. Furthermore, I'm not supposed to look at their genes, because another student is studying that - I just look at what they're doing.

Late last week, my supervisor decided that our experiments were different enough that I *could* look at their genes. This is the last week I have for experiments though, so I've very pushed for time. I had to finish some other experiments before I could set these up. I also had to re-learn advanced techniques that I haven't used since first year.

Today, I was going to do something called *gel electrophoresis*. In simple terms, I was going to use electromagnetism to separate fragments of DNA by length. To do this, I have to melt a gel (called agarose), then add a dye called GelRed before it sets, and then let it set in the right container. GelRed binds to DNA to help you see it - but that also means it can cause cancer.

I've got bad handwriting, and I had written down all the steps. I added 50ml of the molten agarose gel to a container that just about holds 50ml. I've written down that the next step is adding 5ml of GelRed. I'm in a rush, because I have ten minutes before an important meeting. I add the first millilitre... and the agarose goes much redder than I expected.

I check my notes. That 5ml of GelRed? It was supposed to be 5µl. I used 200 times too much. I basically exhausted the lab's supply. 

Worse, that amount of GelRed costs about £110, or $170 US. The total cost of my project was only supposed to be £350. 

I spent the next hour making extra agarose to dilute the GelRed into, missed the meeting, and wasted time I should have been spending running my gel.
<bot>: rushing in a laboratory, misread my notes, added 200x too much of a carcinogen to a mixture I was making up, wasted $170 and disrupted other people's work.