What do you get when you cross a mosquito and a spider?

Nothing! You can’t cross a vector and a scalar! 

(This felt appropriate.)

*Explanation after the read more

In biology a vector is considered an insect or other organism that transmits pathogenic viruses, bacteria, fungi, and parasites. A scalar, like a spider, scales things.

In math a vector is a quantity with both direction and magnitude while a scalar is a quantity with only magnitude. Thus, they are unable to cross.

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