Voiced by D.B. Sweeney, Julianna Margulies, Alfre Woodard, Ossie Davis, Joan Plowright, and Hayden Panettiere. The Good Dinosaur (2015) Image credit: Walt Disney Studios ...

Rocks from deep inside the Chicxulub impact crater show what happened in the minutes to hours after one of our planet’s most catastrophic events.

“The names of the courses have stayed the same, but the content changes every quarter. I’ve never given the same course twice.” That’s an understatement, in the view of one of Sloan’s former students.