Uncovering and explaining how our digital world is changing — and changing us.

Here is the story of the most gloriously stupid Internet beef of 2016.

On Sunday, Grammy-nominated rapper B.o.B announced on Twitter that he does not believe the world is round, then picked a fight with celebrity astrophysicist Neil deGrasse Tyson that culminated in his releasing a catchy ditty that sampled and insulted Tyson — plus the Jews.

Update: Tyson has replied with a diss track of his own, called “Flat to Fact.” It’s performed by Steve Tyson (Neil’s nephew), and it’s honestly nowhere near as good as “Flatline.” It sounds like rap-ified “Schoolhouse Rock,” and ends with Neil deGrasse Tyson reading one of his tweets to B.o.B The whole song is kind of unbearable corny. Nobody really won here. Everyone loses.

Those basic facts of this saga are pretty nuts. Here’s everything that happened up till then.

Throughout Sunday and Monday, the hybrid rock-rap artist tweeted about conspiracy theories. He suggested that the Apollo moon landing was faked, and he tweeted out cocktail-napkin math equations captioning what look like photos edited in Microsoft Paint. He urged people to investigate cloning centers, and for world governments to allow travel through Antarctica to see the edge of the Earth.

Here is a selection, in chronological order, of what he sent out over the past couple days:

https://twitter.com/bobatl/status/691411463051804676

https://twitter.com/bobatl/status/691728266760032256

https://twitter.com/bobatl/status/691777721811255297

Eventually, pop scientist and professional cold-water-thrower Neil deGrasse Tyson stepped into the ring, hoping to persuade an indefatigable B.o.B (real name: Bobby Ray Simmons, Jr.). Here was his argument:

https://twitter.com/neiltyson/status/691647814338629632

https://twitter.com/neiltyson/status/691650342363209729

https://twitter.com/neiltyson/status/691655467978919936

And on Monday night, B.o.B delivered a devastating, fact-free rebuttal in the form of a diss track on Soundcloud. It is called “Flatline — Feat. Neil Tyson.” Its lyrics suggest that Jews control President Obama and reference the prominent Holocaust denier David Irving. B.o.B asks why NASA is part of the Department of Defense, and tells listeners to research Dr. Richard Sauder, the author of a book called “Underwater & Underground Bases: Surprising Facts the Government Does Not Want You to Know.”

Of course, B.o.B is hardly the only the celebrity to believe weird stuff. Moral of the story: Don’t get your science from B.o.B.