On Friday, former US President Barack Obama made a surprise visit to a science, technology, engineering and mathematics (STEM) school in Washington, DC, to encourage the young students there as they embark on a new school year.
During his unannounced visit to McKinley Technology High School he told a group of students, "I do believe that most of the problems we have are going to be solved by you," in a video posted to Instagram, noting that he often had similar meetings with students both in the US and abroad during his eight-year presidency.
The students gasped in shock as Obama strolled in the classroom with a cheery greeting, "How's it going, everybody?" One young man actually grabs his chest in disbelief and needs a moment to compose himself.