In this day and age, on the surface level, it seems like we know a lot about how the world, the human body, and the universe all work. And though we do know quite a bit, there’s still lots of room for scientific progress. Some theories aren’t as solid as you might think, and there are plenty of questions that have researchers puzzled.

Internet users took to an online thread to share what they think are the biggest still-unanswered mysteries that we don’t seem to be close to fully solving yet. Read on to get your creative juices flowing and to think about something bigger than "what should I have for dinner?"

Tossing out one less existential, but who pirated the WGN signal with a Max Headroom skit in the 80s. Lots of theories, but no real evidence and no one has any idea who did it. Kudos

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