#inspired by the triple subscripts on my physics exams

[galaxymagitech]

Okay, but. Mavity. Mavity. Mavity.

I pity physics students in the Doctor Who universe. The universal gravitational constant? M. The acceleration due to gravity on earth? m. A big mass? M. A small mass? m.

And you get this *lovely* equation:

mm = MmM/r^2

Are we talking about millimeters? Candy? Trying to form bizarre emoticons?

But they’re different ms and Ms. So you resort to subscripts and it takes forever to type and you always forget them on exams. And you curse Isaac Newton because, like, couldn’t he have chosen a better letter to start it with? Zavity? Nah, the z-axis…Gravity. Gravity’s nice. And g and G aren’t taken! Why couldn’t he have named it gravity?

And when Shirley Anne Bingham discovers that this torture she suffered throughout uni, her PhD, while doing scientific equations necessary for the preservation of human life under immense time pressure…was the Doctor and Donna’s fault? Well, it’s a good thing she wasn’t ever big on hero worship, because the duo have made her mathematical life hell.