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This illustration provided by researchers depicts Kap Kobenhavn, Greenland, two million years ago, when the temperature was significantly warmer than northernmost Greenland today. Scientists have analyzed 2-million-year-old DNA extracted from dirt samples in the area, revealing an ancient ecosystem unlike anything seen on Earth today, including traces of mastodons and horseshoe crabs roaming the Arctic. (Beth Zaiken via AP)

World’s oldest DNA reveals a lush Arctic landscape in Greenland 2 million years ago

Today it’s a barren Arctic desert, but 2 million years ago, Greenland’s northern tip boasted trees and an array of animals, including mastodons.

Deborah Sampson, left, a nurse at a University of Washington Medical Center clinic in Seattle, gives a Pfizer COVID-19 vaccine shot to a 20-month-old child, June 21, 2022, in Seattle. Pfizer is asking U.S. regulators to authorize its updated COVID-19 vaccine for children under age 5. The youngest tots already are supposed to get three extra-small doses of the original vaccine as their primary series. Pfizer and its partner BioNTech said Monday, Dec. 5, 2022 that if the Food and Drug Administration agrees, the updated vaccine would be used for the third shot. The FDA already has cleared COVID-19 vaccines tweaked to better target omicron as boosters for everyone 5 and older. (AP Photo/Ted S. Warren, file)

Pfizer asks FDA to clear updated COVID shot for kids under 5

FILE - A flu vaccine is readied at the L.A. Care and Blue Shield of California Promise Health Plans' Community Resource Center where they were offering members and the public free flu and COVID-19 vaccines Friday, Oct. 28, 2022, in Lynwood, Calif. On Friday, Dec. 2, 2022, the U.S. Centers for Disease Control and Prevention said that 7.5% of outpatient medical visits the previous week were due to flu-like illnesses. That's as high as the peak of the 2017-18 flu season and higher than any season since. (AP Photo/Mark J. Terrill, File)

Flu season worsens as 44 states report high activity

Norwalk, CA - November 03: Michele Crossan, right, following public health and safety guidelines related to COVID-19, checks the temperature of polling station staff at Los Angeles County Registrar-Recorder/County Clerk on Thursday, Nov. 3, 2022 in Norwalk, CA. (Irfan Khan / Los Angeles Times)

How close is L.A. County to a new COVID-19 mask mandate? Here is what we know

Giancarlo Santos gets a check-up from Dr. Akil Merchant at Cedars-Sinai Medical Center.

The more pandemic precautions fall away, the more COVID risk is concentrated on this one group

MOUNTAIN VIEW, CALIFORNIA - NOVEMBER 03: (L-R) Marc Tessier-Lavigne attends the 2020 Breakthrough Prize Red Carpet at NASA Ames Research Center on November 03, 2019 in Mountain View, California. (Photo by Ian Tuttle/Getty Images for Breakthrough Prize )

Stanford president’s scientific papers draw scrutiny

El director general de Tesla Elon Musk habla durante un evento en Hawthorne, California, el 14 de marzo de 2019. (AP Foto/Jae C. Hong)

Musk’s Neuralink hopes to implant computer in human brain in six months

FILE - This 2003 electron microscope image made available by the Centers for Disease Control and Prevention shows mature, oval-shaped monkeypox virions, left, and spherical immature virions, right, obtained from a sample of human skin associated with the 2003 prairie dog outbreak. U.S. health officials are expanding the group of people recommended to get vaccinated against the monkeypox virus. They also say they are providing more monkeypox vaccine, working to expand testing, and taking other steps to try to get ahead of the outbreak. (Cynthia S. Goldsmith, Russell Regner/CDC via AP, file)

Africa, the continent most affected by mpox, is finally to receive its first vaccines

photo illustration of repeating chimps typing on a vintage typewriter

Strange coincidences: Are they fluke events or acts of God?

The coronavirus known as SARS-CoV-2, shown in purple, infects a cell, colored in green.

COVID-19 Pandemic: News, Links & Resources

Health news, ideas, advice and commentary.

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Covid-19 Pandemic and the Coronavirus

A child wearing a face mask and riding on a scooter passes by a worker in protective suit on his way to collect COVID samples from the lockdown residents in Beijing, Thursday, Dec. 1, 2022. More cities eased anti-virus restrictions as Chinese police tried to head off protests Thursday while the ruling Communist Party prepared for the high-profile funeral of the late leader Jiang Zemin. (AP Photo/Andy Wong)

Some Chinese cities relax coronavirus controls but step up security after protests

Guangzhou, Shijiazhuang, Chengdu and other major Chinese cities said they were easing coronavirus testing requirements and controls on movement.

BEIJING, CHINA - NOVEMBER 30: An epidemic control worker wears PPE to prevent the spread of COVID-19 as he gives a nucleic acid test to a resident as others wait in line wearing face shields before leaving by bus from an area with communities in lockdown on November 30, 2022 in Beijing, China. In recent days, China has been recording its highest number of COVID-19 cases since the pandemic began, as authorities are sticking to their strict zero tolerance approach to containing the virus with lockdowns, mandatory testing, mask mandates, and quarantines as it struggles to contain outbreaks.In an effort to try to bring rising cases under control, the government last week closed most stores and restaurants for inside dining, switched schools to online studies, and told people to work from home among other measures. (Photo by Kevin Frayer/Getty Images)

‘Zero COVID’ is roiling China. But ending the policy may cause a massive health disaster

A Jackson-Hinds Comprehensive Health Center nurse loads a syringe with a Moderna COVID-19 booster vaccine at an inoculation station next to Jackson State University in Jackson, Miss., Friday, Nov. 18, 2022. Moderna recently announced early evidence that its updated booster induced BQ.1.1-neutralizing antibodies. (AP Photo/Rogelio V. Solis)

U.S. renews push for COVID boosters as data show they protect

FILE - Ryan Dutton, an EMT from Rescue Inc., prepares shots of the Pfizer COVID-19 booster vaccine during a vaccine clinic held by Rescue Inc. at Leland & Gray Middle and High School, in Townshend, Vt., on Tuesday, Sept. 20, 2022. The updated COVID-19 boosters aren't an exact match to the newest omicron mutants but Pfizer says lab tests suggest its shot may offer some cross-protection. (Kristopher Radder/The Brattleboro Reformer via AP, File)

Pfizer booster spurs immune response to new Omicron subvariants

U.S. Special Presidential Envoy for Climate John Kerry speaks during a session on the Global Methane Pledge at the COP27 U.N. Climate Summit, Thursday, Nov. 17, 2022, in Sharm el-Sheikh, Egypt. (AP Photo/Nariman El-Mofty)

U.S. top envoy John Kerry tests positive for COVID-19 as U.N. climate talks drag

COVID-19 hospitalizations are rising in infants under 6 months, CDC director says

For some COVID patients, ‘Paxlovid rebound’ has nothing to do with Paxlovid

WHO reports 90% drop in world COVID-19 deaths since February

Pfizer study says updated COVID boosters rev up antibody protection

Covid-19 Vaccines

Los Angeles, CA - December 06: Los Angeles County appears in the midst of another full-blown coronavirus surge, with cases rising by 75% over the last week. The spike is prompting increasingly urgent calls for residents to get up to date on their vaccines and consider taking other preventative steps to stymie viral transmission and severe illness. Commuters with and without face masks Union Station on Tuesday, Dec. 6, 2022 in Los Angeles, CA. (Irfan Khan / Los Angeles Times)

Will you mask up again? A January mandate looms for L.A. if COVID-19 wave worsens

With coronavirus cases surging and hospitalizations worsening, Los Angeles County once again faces the possibility of a renewed public indoor mask mandate.

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