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On Wednesday, the Trumps moved out of the White House and just a few hours later, the Bidens moved in.聽How does that process work and how do they get it done so quickly? Author Kate Andersen Brower, a White House historian, explains that there are around 100 or so staff in the White House and that moving-in day is an "all hands on deck situation" as outside movers are not hired, and why this year, the move was more complicated than usual. She goes on to outline some of the habits of past presidents and first ladies at 1600 Pennsylvania Avenue - including the fact that George Bush loved a peanut butter and honey sandwich and that Hillary Clinton served healthy food.

Photo: Joe Biden's newly-decorated Oval Office at the White House Credit: Reuters