Confusion

It’s like physics, You know there’s gravity, but it works sometimes and sometimes it doesn't. It’s like Chemistry, You know that if you mix bleach and ammonia, it’s bad, yet some people use it to clean. It’s like Biology, You know how many chromosomes you need to have, yet some people are born with more. If I am a falling rock and you’re gravity, will you let me fall? If I am ammonia and you’re bleach will we harm ourselves? If we’re both the same gender, does our biology determine our love for one another?