Can you predict the gender of your unborn baby, by suspending a wedding ring over your tummy? Are other old folk beliefs accurate? Dr Rochford puts them to the test with astounding results. Mobile phones – we all have one these days, but are they bad for our health? We examine the latest research. The old saying goes that cracking your knuckles causes arthritis, but does it? Leila finds out if eating fish can help you live a longer, healthier life. And baldness – men have long searched for remedies, and this week Slats tests two that seem medically proved to work.