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Pete Souza / Official White House photo

Obama ends his presidency in fewer than 24 hours. Below the fold, a message he left for America on his Facebook page.

It's a long-standing tradition for the sitting president of the United States to leave a parting letter in the Oval Office for the American elected to take his or her place. It's a letter meant to share what we know, what we've learned, and what small wisdom may help our successor bear the great responsibility that comes with the highest office in our land, and the leadership of the free world.
But before I leave my note for our 45th president, I wanted to say one final thank you for the honor of serving as your 44th. Because all that I've learned in my time in office, I've learned from you. You made me a better President, and you made me a better man.
Throughout these eight years, you have been the source of goodness, resilience, and hope from which I've pulled strength. I've seen neighbors and communities take care of each other during the worst economic crisis of our lifetimes.
I have mourned with grieving families searching for answers – and found grace in a Charleston church.I've taken heart from the hope of young graduates and our newest military officers. I've seen our scientists help a paralyzed man regain his sense of touch, and wounded warriors once given up for dead walk again. I've seen Americans whose lives have been saved because they finally have access to medical care, and families whose lives have been changed because their marriages are recognized as equal to our own. I've seen the youngest of children remind us through their actions and through their generosity of our obligations to care for refugees, or work for peace, and, above all, to look out for each other.
I've seen you, the American people, in all your decency, determination, good humor, and kindness. And in your daily acts of citizenship, I've seen our future unfolding.
All of us, regardless of party, should throw ourselves into that work – the joyous work of citizenship. Not just when there's an election, not just when our own narrow interest is at stake, but over the full span of a lifetime.
I'll be right there with you every step of the way. And when the arc of progress seems slow, remember: America is not the project of any one person. The single most powerful word in our democracy is the word 'We.' 'We the People.' 'We shall overcome.'
Yes, we can.

Go deeper

Updated 3 hours ago - World

Islamic State claims responsibility for deadly bombing in southern Afghanistan

The mosque after the explosion in southern Kandahar province on Oct. 15. Photo: Murteza Khaliqi/Anadolu Agency via Getty Images

The Islamic State group claimed responsibility for a massive blast that tore through a crowded Shiite mosque in the southern Afghan city of Kandahar on Friday, killing at least 47 people and injuring dozens more, AP reports.

Why it matters: Friday's attack was the deadliest to strike Afghanistan since the U.S. withdrew its troops from the region and is the second major attack on a Shiite mosque in a week, underscoring the Taliban's growing security threat from other militant groups.

New wave of strikes will test worker power

Illustration: Sarah Grillo/Axios

Thousands of John Deere workers hit the picket line this week after the union smacked down a new worker contract from the farm and equipment maker.

Why it matters: There’s a wave of worker angst spreading across the country. They wield new power that’s come with a historic worker shortage.

Bryan Walsh, author of Future
5 hours ago - Technology

The smart city comes of age

Illustration: Aïda Amer/Axios

Better sensors, more intelligent AI, and the coming wave of 5G wireless could finally fulfill the promise of the smart city.

Why it matters: How we organize, run and power our cities will be increasingly important in the years ahead, as urbanization expands and the damaging effects of climate change compound.