Enlarge / NASA officials inside SpaceX's launch control center at Hangar X watch the liftoff of a Falcon 9 rocket a few miles away on March 3, 2024. (credit: NASA/Aubrey Gemignani)

The Federal Aviation Administration alleged Tuesday that SpaceX violated its launch license requirements on two occasions last year by using an unauthorized launch control center and fuel farm at NASA's Kennedy Space Center in Florida.

The regulator seeks to fine SpaceX $633,009 for the alleged violations, which occurred during a Falcon 9 launch and a Falcon Heavy launch last year. Combined, the proposed fines make up the largest civil penalty ever imposed by the FAA's commercial spaceflight division.

“Safety drives everything we do at the FAA, including a legal responsibility for the safety oversight of companies with commercial space transportation licenses,” said Marc Nichols, the FAA's chief counsel, in a statement. “Failure of a company to comply with the safety requirements will result in consequences.”

Enlarge (credit: Memento | Aurich Lawson)

Given the flood of photorealistic AI-generated images washing over social media networks like X and Facebook these days, we're seemingly entering a new age of media skepticism: the era of what I'm calling "deep doubt." While questioning the authenticity of digital content stretches back decades—and analog media long before that—easy access to tools that generate convincing fake content has led to a new wave of liars using AI-generated scenes to deny real documentary evidence. Along the way, people's existing skepticism toward online content from strangers may be reaching new heights.

Deep doubt is skepticism of real media that stems from the existence of generative AI. This manifests as broad public skepticism toward the veracity of media artifacts, which in turn leads to a notable consequence: People can now more credibly claim that real events did not happen and suggest that documentary evidence was fabricated using AI tools.

The concept behind "deep doubt" isn't new, but its real-world impact is becoming increasingly apparent. Since the term "deepfake" first surfaced in 2017, we've seen a rapid evolution in AI-generated media capabilities. This has led to recent examples of deep doubt in action, such as conspiracy theorists claiming that President Joe Biden has been replaced by an AI-powered hologram and former President Donald Trump's baseless accusation in August that Vice President Kamala Harris used AI to fake crowd sizes at her rallies. And on Friday, Trump cried "AI" again at a photo of him with E. Jean Carroll, a writer who successfully sued him for sexual assault, that contradicts his claim of never having met her.

Enlarge / This screenshot of a "Cloud in a dress" mod is being used in place of some other Final Fantasy PC mods that are way too inappropriate for publication on Ars. (credit: Nexus Mods)

Final Fantasy XVI finally arrives on Windows PCs today, over a year after its launch on the PlayStation 5. That means expanded access for a game that sold below Square Enix's expectations on console. But it also means the first opportunity for modders to add their own content to the game.

For game producer Naoki Yoshida, though, that new opportunity comes along with a plea for the user community to behave themselves when modifying the game. In a recent interview with PC Gamer, Yoshida felt the need to step in when director Hiroshi Takai was asked about what "goofy mods" he would like to see in the game.

"If we said, 'It'd be great if someone made xyz,' it might come across as a request, so I'll avoid mentioning any specifics here!" Yoshida told PC Gamer. "The only thing I will say is that we definitely don't want to say anything offensive or inappropriate, so please don't make or install anything like that."

Enlarge / Zihao Ou, who helped develop this solution, holds a tube of it.

One key challenge in medical imaging is to look past skin and other tissue that are opaque to see internal organs and structures. This is the reason we need things like ultrasonography, magnetic resonance, or X-rays. There are chemical clearing agents that can make tissue transparent, like acrylamide or tetrahydrofuran, but they are almost never used in living organisms because they’re either highly toxic or can dissolve away essential biomolecules.

But now, a team of Stanford University scientists has finally found an agent that can reversibly make skin transparent without damaging it. This agent was tartrazine, a popular yellow-orange food dye called FD&C Yellow 5 that is notably used for coloring Doritos.

Playing with light

We can’t see through the skin because it is a complex tissue comprising aqueous-based components such as cell interiors and other fluids, as well as protein and lipids. The refractive index is a value that indicates how much light slows down (on average, of course) while going through a material compared to going through a vacuum. The refractive index of those aqueous components is low, while the refractive index of the proteins and lipids is high. As a result, light traveling through skin constantly bends as it endlessly crosses the boundary between high and low refractive index materials.