But the Imperial College team also looked further back, to when a healthy cell first turned cancerous.
Tippins also goes further back in history, to the building's founding, in 1884, as the home of an association dedicated to the communal-living ideas of the French utopian Charles Fourier.
It also goes further back than just the last half-dozen games if the issue is about the team's style, and the question of whether Van Gaal has to fit in with United's traditions or the club have to fit in with him.
Linden is also reaching further back to the Internet's first online communities to see if there's still value in those, and playing with mobile gaming mechanics that have made Angry Birds and other similar titles so successful.
Where no HIV estimates were available we also looked further back and included estimates published up to 2000.
Mr Hague and Mr Kerry also pledged further backing for Syria's moderate opposition, aimed at bolstering them in the face of rising influence extremists from power in the war-gripped country.
But you can also see references further back in art history, to the early color photography of Paul Outerbridge and other depictions of the female form going back to antiquity.
Polymerization has also been measured further back in the cytoskeletal extension, with rates approximately proportional to the steady-state amount of actin filaments [26], which can be interpreted to be due to the creation of filament plus-ends by severing [12].
"If the house goes higher, it would also have to go further back," she explained.
Our destination was Charlottesville, and as we rode through back roads of an undulating landscape of pastures and forests, we were also working our way further back in time, to a place linked to the country's founders.
