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iPhone 7 plus. Photo: Maciej Luczniewski/NurPhoto via Getty Images

Two big efforts to test horizontal swiping over vertical feed scrolling interfaces may offer hints from Silicon Valley about where mobile UX design is headed.

Be smart: The popular "Stories" format that was created by Snapchat and then adopted by Facebook-owned Messenger, Instagram, WhatsApp and the core Facebook app, have used this function for a while to allow users to advance through more content more quickly.

  1. YouTube has been rolling out a new feature on iOS that will let viewers swipe right or left to navigate between videos, according to an interview with Popular Science. The feature, known internally as “swipey watch,” has been two years in the making, and will be coming to Android devices later this year.
  2. Instagram was in a PR tizzy in December after reports found that it had been testing a new horizontal tap-to-swipe design for months. The company told users that it was just a test that accidentally rolled out widely.

Why it matters, via TechCrunch's Josh Constine: "Tap to advance...eliminates the need for big thumbstrokes on your touch screen that can get tiring after awhile. It also means users always see media full-screen rather than having to fiddle with scrolling the perfect amount to see an entire post. Together, these create a more relaxing browsing experience that can devour hours of a user’s time."

Go deeper: Instagram assures users horizontal feed change was just a test

Go deeper

Scoop: FDA chief called to West Wing

Stephen Hahn. Photo: Mandel Ngan/AFP via Getty Images

White House Chief of Staff Mark Meadows has summoned FDA commissioner Stephen Hahn to the West Wing for a 9:30am meeting Tuesday to explain why he hasn't moved faster to approve the Pfizer coronavirus vaccine, two senior administration officials told Axios.

Why it matters: The meeting is shaping up to be tense, with Hahn using what the White House will likely view as kamikaze language in a preemptive statement to Axios: "Let me be clear — our career scientists have to make the decision and they will take the time that’s needed to make the right call on this important decision."

Scoop: Schumer's regrets

Photo illustration: Eniola Odetunde/Axios. Photo: Mark Wilson/Getty Images   

Chuck Schumer told party donors during recent calls that the death of Ruth Bader Ginsburg and the fact that Cal Cunningham "couldn't keep his zipper up" crushed Democrats' chances of regaining the Senate, sources with direct knowledge of the conversations tell Axios.

Why it matters: Democrats are hoping for a 50-50 split by winning two upcoming special elections in Georgia. But their best chance for an outright Senate majority ended when Cunningham lost in North Carolina and Sen. Susan Collins won in Maine.

Trump's coronavirus adviser Scott Atlas resigns

Photo: Nicholas Kamm/AFP via Getty

Scott Atlas, a controversial member of the White House coronavirus task force, handed in his resignation on Monday, according to three administration officials who discussed Atlas' resignation with Axios.

Why it matters: President Trump brought in Atlas as a counterpoint to NIAID director Anthony Fauci, whose warnings about the pandemic were dismissed by the Trump administration. With Trump now fixated on election fraud conspiracy theories, Atlas' detail comes to a natural end.