Happy moments (by Laura Shon)

Happy moments (by Laura Shon) via Mikhail Semaev http://bit.ly/1dU2cNR

Ari & Milo (by Patrícia Mafra)

Ari & Milo (by Patrícia Mafra) via Mikhail Semaev http://bit.ly/1hc1qQP

The Physics of Friendship: A Tribute to The Big Bang Theory by Owen Davey.