We See and Make
Both have zero gravity, are pitch black and require cool suits for their visitors to breathe with.
Halley's commet appears every 75 years. It appeared when the author Mark Twain was born in 1835 and when he died in 1910. He passed when he was, yup, you guessed it; 75.
They both stand on two legs and share the same protein make-up because, science! And of course, they both lay eggs.
If you eat too much cotton candy, chances are, you'll get to sit in this chair. It's no coincidence that they were both invented by dentists.
See, everything is connected, you just need to know how. And we do.