President Biden's decision to step aside from the race came as a shock to many Americans, including some of his own campaign and White House staff. Even after the disastrous CNN debate against former President Donald Trump and the growing calls from Democrats for him to pass the torch, Biden seemed dug in. So, the question is, what finally changed his mind? 

Over the next hour, CNN's Pamela Brown examines the rise and fall of candidate Joe Biden from his motivations for running against Donald Trump to the final days and hours before his history-making decision. 

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In the last few days, Vice President Kamala Harris has kicked her presidential campaign into high gear, speaking to voters in Wisconsin, Indianapolis, and Texas. She's already picked up the endorsement of leading Democrats, including former president Barack Obama. 

Soon after Kamala Harris became vice president, CNN's Abby Phillip sat down with her to talk about her immigrant routes, the difficulties and controversies she faced as a district attorney and attorney general in California, as well as her journey from prosecutor to politician. 

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Sharks have been around for at least 400 million years, even before dinosaurs walked the earth. These apex predators have a reputation for attacking all sorts of marine life, which sometimes includes the occasional human. But are sharks a danger to people or are people a danger to sharks?

CNN's Boris Sanchez is an experienced diver, and over the next hour he takes us under water with sharks to show us both the beauty and danger of these creatures.

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Since its launch a little more than two years ago, the James Webb Space Telescope has been capturing some of the most spectacular and enlightening images of outer space we've ever seen. Its mission is to study every phase in the history of our universe.

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CNN's Randi Kaye examines how drag performance has become a political target in Florida. Local drag queens and state politicians on both sides offer insight on the cycles of acceptance and backlash that have repeated throughout history.

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80 years after D-Day laid the foundation for Germany's defeat in World War II, Jake Tapper reflects on the sacrifices made to save democracy then and how the fight continues to halt the erosion of democratic governance across the globe.

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Dr. Sanjay Gupta follows Alzheimer's patients' treatments over five years. He explains why it's the most hopeful era for patients, with new research suggesting potential symptom prevention, slowing, and even reversal.

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This emotional report follows transgender student athletes at the center of a culture war, including a softball player's fight for inclusion that reaches the Ohio State Senate and a college swimmer seeking NCAA approval to switch teams.

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Ivan Watson surveys Australia's coast, witnessing the toll of human activity from apocalyptic forest fires to unprecedented heat waves.

Amidst the destruction, he engages with those combating climate change and preparing for the future.

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We are less than seven months away from the next presidential election. But even now, four years after Joe Biden won, there are a number of Donald Trump supporters who dispute those results. And that's not all. They dispute the January 6th attack was an insurrection. They dispute the idea of separation of church and state in America. Some even dispute that the last Super Bowl was played honestly, and they blamed Taylor Swift for rigging the outcome.

CNN's Donie O'Sullivan dives deep into the undercurrent of viral misinformation by speaking directly to those who believe in conspiracies and those who are trying to battle them.

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