judy woodruff speaks with tennesseans from across the political spectrum who are trying to curb gun violenceientists work to harness the power of artificial intelligence to combat climate change. >> this is the pbs newshour from weta studios in washington and in the west from the walter cronkite school of journalism at arizona state university. william: donald trump's social media platforms truth social made its public debut on the nasdaq yesterday. the stock price soared, reportedly powered by supporters. the stock success does not seem to match it's on financials. truth social lost $49 million last year. it also has far fewer users than any other social network that has gone public. the tech research firm similar web estimates truth social at about 5 million users last month, compared to more than 3 billion on facebook and 2 billion on tiktok. dan alexander is a senior editor at forbes who has spent years covering the former president's sprawling business empire and he joins us now. thanks so much for being here. what was your reaction when you saw that truth social stock price shoot throu

for the pbs newshour, i'm judy woodruff in harriman, tennessee.illiam: the dream of artificial intelligence, machines that think like humans is starting to become a reality. about whether we will be able to control a technology about whether we -- that may have a very smart mind of its own. as miles o'brien reports, ai may create new tools to address some of the most complex problems and at the top of the list is the climate emergency. >> as the world grapples with climate change, scientists are turning to an unlikely ally, artificial intelligence. from predicting extreme weather events, ai is emerging as a powerful tool in the fight against global warming. in orlando, florida, my radar is working to combine some tiny satellites with artificial intelligence to detect fires long before they race out of control. that is founder and ceo andy green. >> we are employing ai to do something a human can't. we want to look at the planet to look for disasters in the making. >> take on fluence of technologies, ai coupled with the relentless miniaturization o

. >> joe has been directing the "newshour" with jim lare and with gwen and judy woodruff and now witham with count less news car, election night election hearings, breaking news and live shows from around the world. >> to our team, he has been a steady, wise generous lead whore has made what you at home see better with his care and skill. to me, he's been the calm but firm voice i hear in my area steering the ship propelling us forward and occasionally make us laugh. joseph, we will miss you so. >> joe, thank you for you steady hand in the control room, your camaraderie, your good humor, your dedication to the craft. but above all thanks for being an unwavering source of support to us all. we wish you a retirement as extraordinary as the legacy that you're leaving behind. >> joe, here's to you. thank you. [applause] >> the gold standard. >> we will miss you. so and that is the "newshour." i'm amna nawaz. >> and i've geoff bennett. have a good evening and a great weekend. >> funding for the "newshour" has been provide by -- >> it was like an ah-ha moment. this is what i love doing comp

for the last 15 years, joe has been directing the newshour with jim lehrer as anchor and then judy woodruffasts, election nights and congressional hearings, breaking news and live shows from around the world. amna: to our team he has been a seady, wise, generous leader who has made what you see at home better. to me he has been the calm and firm voice that i hear in my ear. joseph, we will miss you so. geoff: joe, thank you for your steady hand in the control room, your camaraderie, good humor, dedication to the craft but above all thank you for being an unwavering source of support. we wish you a retirement as extraordinary as a legacy you leave behind. amna: here is to you, joe. [applause] geoff: the gold standard. [applause] amna: we will miss you so. and that is at the newshour. geoff: thank you so much for joining us and have a good evening and a great weekend. >> major funding for the pbs newshour has been provided by -- >> it was like an aha moment, this is what i love doing. early-stage companies have this energy that energizes me. these are people who are trying to change at the wo