Grading

I'm grading tests.
A few things.

1)You can easily tell who didn't show up to class at all.
The simplest answers are skipped over for other more ridiculous ones.

2)Balderdash must have invented by a teacher who noticed students desperately trying to answer questions.
Example: Turkana Boy - A boy found in Turkey.
Actually he's found in Kenya.

3)If people look at the test as a whole they might be able to answer other questions.
Most people say dinosaur bones could be radiocarbon dated. Fine, it's bone.
But another question asked the range of radiocarbon dating.
The correct answer is 40 - 75 thousand years ago.
Some people who put this correct answer also put that dinosaur bones could be dated.
Is it just that I'm a nerd, or is it common knowledge that dinosaurs only existed MILLIONS of years ago...?

(Is this breaking some sort of teacher/student confidentiality? Oh well.)