Smartphones not linked to plane crashes, petrol bowser explosions or brain cancerA new smartphone app that measures mood and brain power can show if you are a lark or an owl. (AAP) Source: AAP1 min readPublished 24 August 2017 1:12pmUpdated 24 August 2017 4:46pmBy Winmas YuSource: ABC AustraliaAvailable in other languagesSkip to article contentShare this with family and friendsCopy linkShareThis story is written in Chinese.Share