For only the second time in its history, MIT celebrated its Commencement in an online ceremony. This year’s event featured taped tributes from around the world, a musical composition created specially for the event, and a moving and deeply personal address from civil rights lawyer Bryan Stevenson. In the hourlong webcast, 1,027 undergraduates and 2,271 graduate students were awarded their degrees — some of them, for the first time, instantly receiving electronic versions of the hard-earned credential. In his Commencement address, Bryan Stevenson, noted civil rights lawyer and founder of…