The parts of the brain that get 'smell signals' from the nose also do other things, such as storing memories or provoking emotions. That is why some smells can bring back old memories.
Move over, dogs. The latest evidence suggests humans can match most other animals when it comes to smelling – and even outperform them for certain scents.
For many people suffering from disabling conditions, announcements in the press around breakthroughs in stem cell research undoubtedly bring hope.