Do you know to shine from Happiness?

This photo went round the Facebook. The question on the photo is: do you know to shine from happiness like this?

Why are  they so happy? Look here. When you had such an expression last time? And for ONLY reason that someone caressed you...

Source: imgfave.com via Steve on Pintere

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Source: blog.mybigeyekids.com via tarunverma on Pinterest