Sign up for our daily briefing

Make your busy days simpler with the Axios AM and PM newsletters. Catch up on what's new and why it matters in just 5 minutes.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Catch up on the day's biggest business stories

Subscribe to the Axios Closer newsletter for insights into the day’s business news and trends and why they matter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sign up for Axios Pro Rata

Dive into the world of dealmakers across VC, PE and M&A with Axios Pro Rata. Delivered daily to your inbox by Dan Primack and Kia Kokalitcheva.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sports news worthy of your time

Binge on the stats and stories that drive the sports world with the Axios Sports newsletter. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Tech news worthy of your time

Get our smart take on technology from the Valley and D.C. with Axios Login. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Get the inside stories

Get an insider's guide to the new White House with Axios Sneak Peek. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Denver news?

Get a daily digest of the most important stories affecting your hometown with Axios Denver

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Des Moines news?

Get a daily digest of the most important stories affecting your hometown with the Axios Des Moines newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Twin Cities news?

Get a daily digest of the most important stories affecting your hometown with Axios Twin Cities

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Tampa Bay news?

Get a daily digest of the most important stories affecting your hometown with the Axios Tampa Bay newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Charlotte news?

Get a daily digest of the most important stories affecting your hometown with Axios Charlotte

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Nashville news?

Get a daily digest of the most important stories affecting your hometown with the Axios Nashville newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Columbus news?

Get a daily digest of the most important stories affecting your hometown with the Axios Columbus newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Dallas news?

Get a daily digest of the most important stories affecting your hometown with the Axios Dallas newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Austin news?

Get a daily digest of the most important stories affecting your hometown with the Axios Austin newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Atlanta news?

Get a daily digest of the most important stories affecting your hometown with the Axios Atlanta newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Philadelphia news?

Get a daily digest of the most important stories affecting your hometown with the Axios Philadelphia newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Chicago news?

Get a daily digest of the most important stories affecting your hometown with the Axios Chicago newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sign up for Axios NW Arkansas

Stay up-to-date on the most important and interesting stories affecting NW Arkansas, authored by local reporters

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top DC news?

Get a daily digest of the most important stories affecting your hometown with the Axios DC newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Illustration: Sarah Grillo/Axios

Big Tech, top university labs and the U.S. military are pouring effort and money into detecting deepfake videos — AI-edited clips that can make it look like someone is saying something they never uttered. But video's forgotten step-sibling, deepfake audio has attracted considerably less attention despite a comparable potential for harm.

What's happening: With video deepfakes, defenders are playing the cat to a fast-scurrying mouse: AI-generated video is getting quite good. The technology to create audio fakes, by contrast, is not as advanced — but experts say that's soon to change.

  • "In a couple years, having a voice [that mimics] an individual and can speak any words we want it to speak — this will probably be a reality," Siwei Lyu, director of SUNY Albany's machine learning lab, tells Axios.
  • "But we have a rare opportunity before the problem is a reality when we can grow the forensic technology alongside the synthesis technology," says Lyu, who participates in DARPA's Media Forensics program.

Why it matters: Experts worry that easily faked but convincing AI impersonations can turn society on its head — running rampant fake news, empowering criminals, and giving political opponents and foreign provocateurs tools to sow electoral chaos.

  • In the U.S., fake audio is most likely to supercharge political mayhem, spam calls and white-collar crime.
  • But in places where fake news is already spreading disastrously on Telegram and WhatsApp (think India or Brazil), a persuasive tape of a leader saying something incendiary is especially perilous, says Sam Gregory of Witness, a human-rights nonprofit.

There are two main ways to use AI to forge audio:

Detecting audio deepfakes requires training a computer to listen for inaudible hints that the voice couldn't have come from an actual person. Lyu and UC Berkeley's Hany Farid are researching automated ways to do this.

  • Google recently made a vast dataset of its own synthetic speech available to researchers who are working on deepfake detection. This trove of training data can help AI systems find and recognize the hallmarks of fake voices.
  • For an international competition, 49 teams submitted deepfake detectors trained with Google's contribution, plus voices from 19 other sources in various languages. The top entrants were highly accurate, said competition co-organizer Junichi Yamagishi, a researcher at Japan's National Institute of Informatics. The best system only made mistakes 0.22% of the time, he tells Axios.

Pindrop, an Atlanta company that sells voice authentication to big banks and insurance companies, is also developing defenses, worried that the next wave of attacks on its clients will involve deepfake audio.

  • One key to detecting fakes, according to the company: sounds that seem normal, but that people aren't physically capable of making.
  • An example from Pindrop CEO Vijay Balasubramaniyan: If you say "Hello, Paul," your mouth can only shift from the "o" to "Paul" at a certain speed. Spoken too fast, "the only way to say this is with a 7-foot-tall neck," Balasubramaniyan says.

The bottom line: If deepfake detectors can get out ahead of the spread of fake audio, they could contain the potential fallout. And, unlike with video, it looks like the defenders could actually keep up with the forgers.

Go deeper: Audio deepfakes are getting better — but they haven't made it yet

Go deeper

Updated 3 hours ago - Politics & Policy

Omicron dashboard

Illustration: Shoshana Gordon/Axios

  1. Health: Axios-Ipsos poll: Omicron's big numbersAnother wave of death — FDA limits use of Regeneron and Lilly antibody treatments — Fauci: "Confident" Omicron cases will peak in February.
  2. Vaccines: Pfizer begins clinical trial for Omicron-specific vaccine — The shifting definition of fully vaccinated.
  3. Politics: Biden admin withdraws temporary vaccine-or-test mandate for large employers — New York Supreme Court strikes down Gov. Hochul's mask mandate for public areas — Sarah Palin tests positive, delaying defamation trial — Virginia school boards sue Gov. Youngkin for lifting mask mandate.
  4. World: U.K. to lift travel testing requirement for fully vaccinated — Beijing Olympic Committee lowers testing threshold ahead of Games.
  5. Variant tracker

The Robinhood M&A rumor mill churns

Illustration: Sarah Grillo/Axios

Robinhood's valuation is now just over $11 billion, a fraction of where it traded in August and below that of its last private round of funding. Cue the M&A mongers.

Why it matters: It's not just Robinhood—falling values of growth-oriented tech stocks have raised speculation that formerly high-flying fintechs could be snapped up by more well-capitalized buyers.

4 hours ago - Health

Student's death renews calls for schools to stock opioid overdose drug

Photo: Amy Davis/Baltimore Sun/Tribune News Service via Getty Images

A Connecticut student's death has renewed calls for schools to stock and administer naloxone, a drug that can quickly reverse the effects of an opioid overdose.

Why it matters: U.S. drug overdose fatalities reached six figures in a 12-month period for the first time in November, and synthetic or natural opioids were the cause of a majority of the overdoses.