system
Given the following post, respond as if you're commenting on Reddit:
human
Is there ANY scientific evidence to suggest that you can influence the probability of your offspring being a particular gender?

There are many old wives tales and the occassional blog or blogtervisement claiming that you can increase your chances of conceiving boy or girl according to your preference. 

Is there any fragment of truth to any of them or are they all complete horseshit?
gpt
If your old wives' tale involves ultracentrifugation of a semen sample to separate sperm by the mass difference between the X and Y chromosomes, then there might be something to it.

EDIT: That's the way it's often done for the livestock industry and perhaps some humans - that or sorting the cells with a fluorescent dye attached to an antibody that specifically binds one sex chromosome or the other. If there were a simpler way, you'd better believe they'd be all over that.