In his final letter before he vanished on Mount Everest, George Mallory said his chances of reaching the world's highest peak were "50 to 1 against us."
The first witness in former President Donald Trump's New York criminal trial is expected to retake the stand Tuesday morning after a hearing over Trump's social media posts.
Tires emit huge volumes of particles and chemicals as they roll along the highway, and researchers are only beginning to understand the threat. One byproduct of tire use, 6PPD-q, is in regulators' crosshairs after it was found to be killing fish.
John Dickerson reports on the first witness to testify in Donald Trump's criminal trial, why sharks are important for the health of the oceans, and which drugs are in short supply.
