Swimming after eating … is it really as bad as your mum told you? Michael Slater takes to the pool to find out. Bottled, filtered or plain old tap … Leila McKinnon discovers which water is best for children’s teeth. Curing insomnia—is counting sheep the secret to quality shut eye? Will eating carrots improve your night vision? - Dr Andrew Rochford downs 15 kilos in 10 days and puts the theory to the test…