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Katy Perry debuts title track Smile from fifth studio album; release on 14 August
Can't rely on facial expressions to understand the emotions of people says new study
Alibaba.com looks to rev up 10 million Indian businesses onboard
Prehistoric fish reveals the secret of your smile
Smiling speeds recovery from stress: Study
Smiling can help speed your body's recovery from stress by lowering your heart rate levels, a new study has claimed.
