Fair or no?

A simple question for everyone. Miss 15 is taking an advanced science class this year. We opted out of the advanced English in order to afford her more time away from homework. With swimming, 2 advanced classes and geometry, she worried she'd never have two minutes to take a shower.

Don't know why I told you all that background, but the question has to do with science class. On Friday Miss 15 and her partner soaked an egg in vinegar in order to dissolve the shell. Today they had to rub away the shell, not on a boiled egg, on just your normal every day run of the mill egg, while they were attempting to do so, the egg broke. Because their egg broke, they are being docked one letter grade on the experiment, and they have to start over. If the egg breaks again, they are dropped another grade. And this grade doesn't include the rest of the experiment and their conclusions and hypotheses they draw from it. So as of right now, without any questions done or anything, they are starting from a B. To me, this seems wrong. How many times have eggs broken? Rub the shell off of an egg and don't break it? That alone sounds incredibly difficult. But is it right to drop them a letter grade because it breaks?

In other news, Hubby stayed home the entire weekend. It was blissful and wonderful just having him around. Especially since he took care of me and my cold. Even Miss 10 couldn't get enough and followed him around all weekend.
It's good to have 2 parents around. Especially for me!