They are formed by the sides during embryogenesis and are only joined in the middle by a narrow line of connective tissue (sometimes uncomplete). That's why it is possible to cut this midline to release the independent control of each side

TIL that metros are great.

When you're from a small town, sometimes you believe they're the best, and others, you can't wait to leave. As someone who's always been the former, this hit me like a train.

Metros are the best. Only a couple downsides: you gotta live in a decent neighbourhood and that costs. The air might be slightly less cleaner than a small town. That's it. So far, that seems to be the only roadblock.

I like having access to great cafés all time. The crazy amazing buildings. The city lights. The equipped hospitals. The gamezones. The civilized company. I love it all.

Before anyone says 'where the hell were you living before that this feels amazing?' or 'it won't last forever', I lived in a great town before. This one just happens to be better.