This is the 17th instalment in a series on dementia, including the research into its causes and treatment, advice for carers, and stories of hope. You’ve got to keep smiling, says Timothy Kwok ...

Babies are naturally attuned to female voices and faces, and their smiles often prompt a dopamine release in their parents, elevating mood and strengthening bonds. Smiling is not just an emotional ...

Sensors detect whether a patient is correctly imitating the movement. The display then flashes a smiling face if users strike the correct pose, and a frown otherwise. These are among a range of ...