Ever spotted a mysterious puddle of water on top of your yoghurt pot and wondered what it is? Dr Karan Raj, of Sunderland University, claims that while it may seem gross, this is far from the truthEver spotted a mysterious puddle of water on top of your yoghurt pot and wondered what it is? Dr Karan Raj, of Sunderland University, claims that while it may seem gross, this is far from the truth