So, I'm not really sure if this is a life hack, but it's pretty weird. I don't know if anyone else has ever thought about this but it kind of freaks me out.

     So, have you ever thought that we all see colors differently? Like, my red is your blue and your blue is my red. We know what colors we're talking about because that's how we learned them to be. The weird thing is that we would never know because there is no real way to figure it out.

Just thought I'd share.