Credit: NICHD/S. Jeong

Scientists have traced how an "itch" in the body turns into a neural impulse to "scratch" it in the brain.

How they did it: Researchers at the Chinese Academy of Sciences suppressed parts of the spinal cords in mice in order to stop scratching behavior that had been triggered by an itch sensation. Then, using a light-based system able to trace the mice's neural circuitry, they followed the itch-to-scratch mechanism from the spinal cord to a part of the brainstem called the parabrachial nucleus that is involved in registering pain and other sensations.

Why it matters: Scientists would like to understand how to turn off the command to scratch an itch because it could lead to a treatment for chronic scratching that damages the skin.

Open questions, per Science News.

  • The parabrachial nucleus is thought to be the first stop for processing the itch— where does it go from there?
  • The study was done in mice — does the same mechanism hold in humans?
  • There are different itches, like those from an allergy. Are they processed the same way by the brain?

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Trump issues order banning TikTok within 45 days

Illustration: Aïda Amer/Axios

Americans and U.S. companies will be banned from making transactions with ByteDance, the Chinese owner of TikTok, in 45 days, according to a new executive order President Trump issued Thursday evening.

The big picture: Last week Trump announced his intention to ban TikTok but said he'd leave a 45-day period for Microsoft or other U.S.-based suitors to try to close a deal to acquire the popular video-sharing app.

Bill Hagerty wins Republican Senate nomination in Tennessee primary

Former U.S. Ambassador to Japan Bill Hagerty speaking at CPAC in 2019. Photo: Mandel Ngan/AFP via Getty Images

Former U.S. Ambassador to Japan Bill Hagerty won the Tennessee Republican Senate primary on Thursday evening, beating out surgeon Manny Sethi for GOP Sen. Lamar Alexander's seat, who announced his retirement in late 2018, AP reports.

Why it matters: Though the race narrowed in July, Hagerty — who received President Trump's endorsement in 2019 — stuck close to the president's messaging and touted his Tennessee roots.

Updated 2 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Eniola Odetunde/Axios

  1. Global: Total confirmed cases as of 7:30 p.m. ET: 18,982,658 — Total deaths: 712,266— Total recoveries — 11,477,642Map.
  2. U.S.: Total confirmed cases as of 7:30 p.m. ET: 4,873,747 — Total deaths: 159,931 — Total recoveries: 1,598,624 — Total tests: 59,652,675Map.
  3. Politics: Pelosi rips GOP over stimulus negotiations: "Perhaps you mistook them for somebody who gives a damn" — Ohio Gov. Mike DeWine tests positive.
  4. Public health: Majority of Americans say states reopened too quicklyFauci says task force will examine aerosolized spread.
  5. Business: The health care sector imploded in Q2More farmers are declaring bankruptcyJuly's jobs report could be an inflection point for the recovery.
  6. Sports: Where college football's biggest conferences stand on playing.