Peter Larson

Did the Tyrannosaurus rex have feathers, as some scientists have wondered in recent years? No, says a new study. Unlike some of its feathered ancestors, the T. rex was covered in scales.

The discovery: Scientists found fossilized, scaly skin on the T. rex and other tyrannosaur species in North America and Asia, a strong challenge to the idea that T. rex w was covered in feathers like some of its ancestors. "(This) shows without question that T. rex had scaly skin," Phil Bell, a paleontologist at Australia's University of New England, told The Washington Post.

One big question: If its ancestors had feathers, why did the T. rex evolve with scales as it became Earth's apex predator 70 million years ago? The researchers propose it may have been the dinosaurs' large size: bigger bodies can more easily maintain a constant body temperature and feathers could have trapped unwanted heat.

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Updated 26 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Annelise Capossela/Axios

  1. Global: Total confirmed cases as of 6:30 p.m. ET: 20,177,521 — Total deaths: 738,716 — Total recoveries: 12,400,156Map.
  2. U.S.: Total confirmed cases as of 6:30 p.m. ET: 5,130,784 — Total deaths: 164,603 — Total recoveries: 1,670,755 — Total tests: 62,513,174Map.
  3. States: Georgia reports 137 coronavirus deaths, setting new daily record Florida reports another daily record for deaths.
  4. Health care: Trump administration buys 100 million doses of Moderna's coronavirus vaccine.
  5. Business: Moderna reveals it may not hold patent rights for vaccine.
  6. Sports: Big Ten scraps fall football season.

Voters cast ballots in Minnesota, Georgia, Connecticut, Wisconsin and Vermont

Photo: Spencer Platt/Getty Images

Primary elections are being held on Tuesday in Minnesota, Georgia, Connecticut, Vermont and Wisconsin.

The big picture: Georgia and Wisconsin both struggled to hold primaries during the coronavirus pandemic, but are doing so again — testing their voting systems ahead of the general election. Rep. Ilhan Omar (D-Minn.) is facing a strong challenger as she fights for her political career. In Georgia, a Republican primary runoff pits a QAnon supporter against a hardline conservative.

55 mins ago - Health

Trump administration buys 100 million doses of Moderna's vaccine

A volunteer in Moderna's vaccine clinical trial receives a shot. Photo: Paul Hennessy/NurPhoto via Getty Images

The U.S. government has agreed to buy 100 million doses of Moderna's experimental coronavirus vaccine for $1.5 billion, or $15 per dose.

Why it matters: The Trump administration, through Operation Warp Speed, has now bought initial batches of vaccines from Moderna, GlaxoSmithKline and Sanofi, Pfizer, Novavax, Johnson & Johnson and AstraZeneca before knowing whether they are safe and effective. The federal government also appears to own some of the patent rights associated with Moderna's vaccine.