None of us know what Donald Trump will do once he becomes President Trump. What we do know is what he has said he wants to do and what powers he will have, should he choose to act. That's why activists are urging President Obama to do all that he can in the weeks he has left to leave the presidency nicer than he found it and to place some limits on the abilities of a potentially reckless new ruler.

Brooke and Bob talk to advocates and experts who have compiled a "must-do" list for Obama's final month in office, ranging from surveillance oversight to digital preservation to clemency to climate action. Then, we hear from the White House itself about what the administration actually plans to do with the limited time.

Finally, a discussion with writer James Gleick about the nature of time and how our understanding of it has evolved over time.

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