In the absence of a giant ruler, how does one go about measuring how far the Earth is from a star? Simon Singh explains in this QotW.  Plus, we ask where in the world gravity feels strongest. Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Where on Earth is gravity the strongest?

Each week we set out to solve one of the world's weirdest, wackiest, funniest and funkiest scientific puzzles. And along with the answer there's a brand new question to think about for next time...