There are three types of medical micromotors scientists hope can carry out these functions: chemical, physical, and biohybrid.

How they're different:

  • Chemical micromotors react to the liquids around them by using platinum or silver as a catalyst.
  • Physical micromotors manifest as a magnetic helix that act like cargo mules for the body and could perform biopsies or microsurgeries.
  • Biohybrid micromotors are bacteria-driven — they follow bacteria and can be controlled through an external force (think: magnetism) to control and move things around in the body.

Why it matters: "With a coordinated push, microbots could usher in an era of non-invasive therapies within a decade," said Mariana Medina-Sánchez and Oliver G. Schmidt, the researchers behind the essay. Furthermore, the emergence of medical micromotors could revolutionize the types of medicines able to be administered throughout the body, as well as give surgical access to people in more rural areas.

The challenges:

  • Most are currently fueled by toxic chemicals like hydrogen peroxide.
  • Navigating the human body - this is more difficult than making it around a Petri dish.
  • Safety - researchers will have to demonstrate microbots can be removed or breakdown in the body.

Go deeper

Updated 3 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Global: Total confirmed cases as of 4:30 p.m. ET: 21,020,216 — Total deaths: 761,393— Total recoveries: 13,048,303Map.
  2. U.S.: Total confirmed cases as of 4:30 p.m. ET: 5,289,323 — Total deaths: 167,948 — Total recoveries: 1,774,648 — Total tests: 64,831,306Map.
  3. Health: CDC: Survivors of COVID-19 have up to three months of immunity Fauci believes normalcy will return by "the end of 2021" with vaccine — The pandemic's toll on mental health.
  4. Business: How small businesses got stiffed — Unemployment starts moving in the right direction.
  5. Cities: Coronavirus pandemic dims NYC's annual 9/11 Tribute in Light.
  6. Politics: Biden signals fall strategy with new ads.

Harris: "Women are going to be a priority" in Biden administration

Sen. Kamala Harris at an event in Wilmington, Del. Photo: Drew Angerer/Getty Images

In her first sit-down interview since being named Joe Biden's running mate, Sen. Kamala Harris talked about what she'll do to fight for women if elected VP, and how the Democrats are thinking about voter turnout strategies ahead of November.

What they're saying: "In a Biden-Harris administration women are going to be a priority, understanding that women have many priorities and all of them must be acknowledged," Harris told The 19th*'s Errin Haines-Whack.

Facebook goes after Apple

Illustration: Lazaro Gamio/Axios

Facebook is seeking to force a face-off with Apple over its 30% in-app purchase commission fee, which Facebook suggests hurts small businesses struggling to get by during the pandemic.

The big picture: Facebook has never publicly gone after Apple, a key strategic partner, this aggressively. Both companies face antitrust scrutiny, which in Apple's case has centered on the very fee structure Facebook is now attacking.