$40,047,425,768,420 in U.S. Debt, and an Experimental Vaccine for Skin Cancer

Plus, could tweaking flight paths reduce global warming?  Here’s what we’re covering: U.S. Debt Hits $40 Trillion as America’s Borrowing Binge Continues, by Alan Rappeport Israel Opens Criminal Inquiries Into Killings of Hind Rajab, 5, and of Medics, by Isabel Kershner A New mRNA Vaccine Could Prevent Skin Cancer From Returning, by Carolyn Y. Johnson U.K. to Test Whether Tweaks to Trans-Atlantic Flight Paths Affect Global Warming, by Leo Sands Tune in every weekday morning, and tell us what you think at: [email protected]. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify. You can also subscribe via your favorite podcast app here https://www.nytimes.com/activate-access/audio?source=podcatcher. For more podcasts and narrated articles, download The New York Times app at nytimes.com/app. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.