Which everyday scientific mystery would you most like a definitive answer to?

Despite decades of neuroscience, there's still no consensus on why our brains conjure vivid narratives while we sleep. A definitive answer could reshape how we understand memory and mental health.

How does a lump of grey matter produce the feeling of being you? It's arguably the biggest open question in science and philosophy alike.

With billions of galaxies out there, the silence is deafening. A firm yes or no would fundamentally alter humanity's sense of place in the cosmos.

We can measure its gravitational pull but haven't the foggiest what it actually is. Solving it would rewrite physics textbooks overnight.

Sugar pills genuinely ease real symptoms, sometimes rivalling actual drugs. Understanding the mechanism could transform how medicine is practised.