The notion of coronavirus immunity is still in question after an announcement from South Korea's CDC.

In a Monday briefing, South Korea's Centers for Disease Control and Prevention announced 51 people "cured" after contracting COVID-19 had tested positive for the disease after being released from quarantine. CDC Director Jeong Eun-kyeong leaned toward deeming these cases a "reactivation" of the virus, but will study it further.

While it was never certain, the idea that people who test positive for and then recover from the new coronavirus gain immunity from the disease had even informed government policy in some countries. The U.K. originally resisted closing down businesses and enforcing social distancing guidelines in an effort to spread "herd immunity" among its citizens, for one.

But this latest announcement calls the herd immunity strategy into further question. Patients are deemed recovered when they test negative for the disease twice in 24 hours. Yet in at least 51 cases, people who had apparently recovered had tested positive again shortly after they left quarantine. "While we are putting more weight on reactivation as the possible cause, we are conducting a comprehensive study on this," Jeong said. Those patients may not have even been cured at all, seeing as "there have been many cases when a patient during treatment will test negative one day and positive another," he said. Kathryn Krawczyk

Ah, Florida, land of sunshine, beaches, and notoriously competent elections.

That's the picture President Trump painted Tuesday in a tweet where he finally acknowledged absentee voting and voting by mail are the same thing. "Whether you call it vote by mail or absentee voting, in Florida the election system is safe and secure, tried and true," Trump tweeted, despite falsely claiming the two terms were different and also wracked with fraud several times in the past. "Florida's election system has been cleaned up," Trump went on to claim, in an apparent attempt to overlook the hanging chads of past presidential elections.

Trump has explicitly and falsely claimed in the past that absentee voting and voting by mail are different, and that the latter is ripe for fraud; neither of these things are true. His attacks have ramped up as it becomes clear absentee voting will dominate the November election and make it safe for more people to vote during the COVID-19 pandemic. But it's unclear just what sets Florida's election system apart in Trump's mind — perhaps it's because Florida is a swing state that Trump will need a high turnout from elderly voters to win, or the fact that Trump has voted there by mail several times in the past. Kathryn Krawczyk

A massive explosion has just rocked Beirut, as captured in a number of shocking videos from the scene.

The capital of Lebanon on Tuesday was hit by a huge explosion that caused damage for miles and left an unknown number of people injured, The Associated Press reports. Numerous staggering videos quickly emerged on social media showing the blast.

The explosion in central Beirut damaged buildings in "several neighborhoods," and "many roads were blocked by the debris, forcing people wounded in the blast to walk through the smoke to hospitals," The New York Times reports.

Further details about the explosion and the extent of the damage weren't immediately available, but Lebanon Health Minister Hamad Hasan reportedly said there were a "very high number of injuries," per Reuters, and according to CNN, the state-run National News Agency is reporting that the source of the explosion was "believed to be a major fire at a warehouse for firecrackers near the port in Beirut." Brendan Morrow

August is known in the book industry as the "dead zone," when agents and editors take their vacations ahead of one of the busiest months of the publishing calendar, September. But there are no summer doldrums this year: with movies and new television on pause due to the coronavirus pandemic, books have remained one of the few forms of entertainment able to proceed relatively unaffected — and they're successfully filling the void.

On Tuesday alone, a number of notable releases hit the (virtual) shelves, including Caste: The Origins of Our Discontents by Pulitzer Prize-winner Isabel Wilkerson. "It's an extraordinary document, one that strikes me as an instant American classic and almost certainly the keynote nonfiction book of the American century thus far," raved The New York Times. Oprah Winfrey, in announcing Tuesday that Caste is her new book club selection, told CBS This Morning that "all of humanity needs to read this" and that it might be "the most important book" she's ever picked.

On the fiction front, also out Tuesday is Luster, the debut by Raven Leilani, described by BuzzFeed News as "the next great millennial novel." The book has been gaining buzz for weeks — "doesn't it feel like everyone is raving about this debut?" The Millions wrote — but Luster stands out for "the quality of the writing itself." Having read an early copy, I can attest: It deserves all the hype, and more.

Other late summer books have also earned raves — the memoir Wandering in Strange Lands by Morgan Jerkins, Laura van den Berg's short fiction collection I Hold a Wolf by the Ears, the novel Migrations by Charlotte McConaghy, the memoir Memorial Drive by poet Natasha Trethewey — which makes it tempting to correlate the extraordinary summer publishing is having with the pandemic. That might be a stretch though: while some release dates have been moved up, most August releases were set pre-pandemic.

More likely, the lack of noise coming from the other usual spheres of entertainment means the major releases in publishing especially stand out. As Stephanie Meyer, the author of Midnight Sun, a new Twilight novel out Tuesday, offered to the probing New York Times about why this book, why now: "Because I finished it." Plus, "I am really excited when I have a book to read right now, because there's not much else that's exciting." Jeva Lange

President Trump apparently didn't watch much Looney Tunes as a kid. Otherwise, thanks to Yosemite Sam, he'd probably know how to pronounce the name of one the United States' more famous national parks.

While signing the bipartisan Great American Outdoors Act — a conservation bill aimed at repairing national park infrastructure, permanently funding the Land and Water Conservation Fund, and creating thousands of jobs — on Tuesday, the president waxed poetic about the "towering sequoias" in California's Yosemite National Park. Unfortunately, he flubbed the pronunciation (twice), which wound up overshadowing the majestic image he was trying to conjure. Tim O'Donnell

Kanye West's alleged presidential bid is abandoning the Garden State.

West, the rapper whose announcement that he'd be entering the 2020 presidential race last month was met with widespread skepticism, has scrapped his effort to appear on the ballot in New Jersey, the New Jersey Globe reports.

West had submitted the petition signatures required to get on the ballot, but the signatures were challenged by a lawyer, Scott Salmon, who called them "egregiously bad, almost to a degree insulting," Politico reports. Not only was some necessary information and paperwork reportedly not provided, but a complaint said that "a number of signatures appear nearly identical," The Associated Press writes.

"At this time, Kanye 2020 has no further option than to regrettably withdraw from New Jersey and cease further efforts to place Mr. West's name on the New Jersey ballot," the campaign said in an email as it withdrew the petition, per AP.

West did previously qualify for the Oklahoma ballot, but in addition to New Jersey, he's also facing challenges while trying to get on the ballot in Illinois, reports New York Magazine. By the time West announced his intent to run for president, the deadline to appear on the ballot had already passed in many states, and more deadlines are fast approaching, as The Washington Post's Dave Weigel helpfully illustrates.

In fact, as Weigel notes, West already isn't going to be on the ballot in states with more than 200 electoral votes. In other words, don't bet on an upset win by the Birthday Party. Brendan Morrow

President Trump may end up throwing out what was supposed to be the biggest foreign policy achievement of his first term.

Trump has spent pretty much all of his presidency trying to work out a trade deal with China, sparking an all-out tariff war along the way. But all of that may have been for naught as Trump's advisers work to convince him to "nuke" the whole thing before November, saying it's his best chance to boost his re-election chances, four people with knowledge of the situation tell The Daily Beast.

National and swing state polls keep putting former Vice President Joe Biden safely ahead of Trump to win this fall's election, and advisers have been looking for ways to change his fate. Conservative economist Stephen Moore tells The Daily Beast it could benefit Trump to capitalize on anti-China sentiment both within the White House and around the country right now. And while Moore stopped short of calling to completely abandon the trade deal, Trump trade adviser Peter Navarro and other aides have reportedly gotten Trump at least considering it.

The U.S. and China reached a "phase one" trade deal in February, which didn't actually mark much concrete progress after two years of negotiations and tit-for-tat tariffs. Trump has only ramped up his criticism of China since then, and has repeatedly said he wants to hold it responsible for the coronavirus pandemic. It's unclear how blowing up the deal would punish China for COVID-19 or help the American farmers and businesses who the trade war has hurt along the way. Kathryn Krawczyk