Bellingcat – As reports of war crimes in Ukraine continue at the hands of the Russian military, 60 MINUTES goes inside Bellingcat, a team of online data detectives, and its investigations to look at how they build their cases. Scott Pelley speaks with founder Eliot Higgins about how his organization is building a database of social media exposing the alleged war crimes. Pelley reports that Bellingcat has trained more than 4,000 journalists and war crimes investigators in its techniques of geolocation, verification, and data mining. Sharswood – 60 MINUTES' Lesley Stahl visits Fred Miller and his family in the large house in southern Virginia that they recently bought to host family gatherings, only to discover that their own ancestors had once been enslaved on that very property. Miller's sister and cousins scoured historical records and enlisted a genealogist to find evidence that their great-great-grandparents, Violet and David Miller, were enslaved on the plantation, then-called Sharswood. The dilapidated building still standing behind the main house has been identified by archeologists as living quarters for some of the enslaved men and women there. Buying this home has opened a window into the Miller family's past that was not discussed within their family, and that many African American families struggle to obtain. This is a double-length segment.