How do energy drinks affect us?

Why don't I have fingerprints? Why do the helium balloons in my car move the opposite way to people? Do other moons face their planet at the same time? How do energy drinks affect your body? What makes a person left handed? Why do I sneeze when I look at the sun? Could a fly travel at lightspeed? Do you have to gender match a heart transplant? Like this podcast? Please help us by supporting the Naked Scientists