Jared Thomas / University of Illinois at Urbana-Champaign

About 115 million years ago, when the continents were one, dinosaurs ruled and flowering plants were just debuting on Earth, a mushroom growing alongside a river fell into the water and was carried away to a lagoon where it was preserved in limestone. That may have been the making of the oldest known fossil of a mushroom - which will typically live for just a few days and are rarely fossilized - that was found in Brazil, scientists reported this week. Named Gondwanagaricites magnificus, the mushroom is very similar to those on Earth today.

Why it matters: The fossil record of mushrooms is sparse: only 10 had ever been found and this is the first from the supercontinent Gondwana. It promises to shed light on the evolution of fungi that play a vital role in processing and recycling nutrients in the environment.

Go deeper

Warren and Clinton to speak on same night of Democratic convention

(Photos: Abdulhamid Hosbas/Anadolu Agency via Getty Images, Sean Rayford/Getty Images)

Sen. Elizabeth Warren and Hillary Clinton both are slated to speak on the Wednesday of the Democratic convention — Aug. 19 — four sources familiar with the planning told Axios.

Why it matters: That's the same night Joe Biden's running mate (to be revealed next week) will address the nation. Clinton and Warren represent two of the most influential wise-women of Democratic politics with the potential to turn out millions of establishment and progressive voters in November.

Trump considering order on pre-existing condition protections, which already exist

President Trump. Photo: Jim Watson/AFP via Getty Images

President Trump announced on Friday he will pursue an executive order requiring insurance companies to cover pre-existing conditions, something that is already law.

Why it matters: The Affordable Care Act already requires insurers to cover pre-existing conditions. The Trump administration is currently arguing in a case before the Supreme Court to strike down that very law — including its pre-existing condition protections.

Updated 19 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 8:30 p.m. ET: 19,266,406 — Total deaths: 718,530 — Total recoveries — 11,671,253Map.
  2. U.S.: Total confirmed cases as of 8:30 p.m. ET: 4,928,802 — Total deaths: 161,052 — Total recoveries: 1,623,870 — Total tests: 60,415,558Map.
  3. Politics: Trump says he's prepared to sign executive orders on coronavirus aid.
  4. Education: Cuomo says all New York schools can reopen for in-person learning.
  5. Public health: Surgeon general urges flu shots to prevent "double whammy" with coronavirus — Massachusetts pauses reopening after uptick in coronavirus cases.
  6. World: Africa records over 1 million coronavirus cases — Gates Foundation puts $150 million behind coronavirus vaccine production.