A gas station attendant stands next to a newspaper headline in Pretoria, South Africa, on Saturday. The new omicron variant has spread from South Africa to parts of Europe, and as far as Hong Kong. Denis Farrell/AP hide caption
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Travelers walk near an electronic flight notice board displaying canceled flights at O.R. Tambo International Airport in Johannesburg, South Africa, on Saturday. Several countries have begun travel bans in response to the omicron variant. Phill Magakoe/AFP via Getty Images hide caption
Three generations, (from left to right) grandmother Genoveva Calloway, daughter Petra Gonzales, and granddaughter Vanesa Quintero, live next door to each other in San Pablo, Calif. Recently their extended family was hit with a second wave of COVID infections a year after the first. Beth LaBerge/KQED hide caption
COVID hit 13 members of their family the first time. A year later it struck again
A young woman reacts as she receives a Pfizer jab against COVID-19, in Diepsloot Township near Johannesburg Thursday, Oct. 21, 2021. Denis Farrell/AP hide caption
Specialist Meric Greenbaum, left, works at his post on the floor of the New York Stock Exchange on Black Friday. Stocks dropped after a coronavirus variant appears to be spreading across the globe. Richard Drew/AP hide caption
The Oregon-born wolf known as OR93 near Yosemite, Calif. in February 2021. The wolf thrilled biologists as it journeyed far south into California, but was found dead after apparently being struck by a vehicle. California Department of Fish and Wildlife via AP hide caption
Corals fertilize billions of offspring by casting sperm and eggs into the Pacific Ocean off the Queensland state coastal city of Cairns, Australia, Tuesday, Nov. 23, 2021. Gabriel Guzman/AP hide caption
The SpaceX Falcon 9 rocket launches with the Double Asteroid Redirection Test, or DART, spacecraft onboard from Space Launch Complex 4E, at Vandenberg Space Force Base in Calif. Bill Ingalls/AP hide caption
How To Choose A Health Insurance Plan
A recent survey says about half of Americans are planning to attend gatherings of 10 or more people over the holidays. Spencer Platt/Getty Images hide caption
A nurse fills a syringe with COVID-19 vaccine at a mass vaccination site in Kansas City, Mo. on March 19, 2021. Orlin Wagner/AP hide caption
An illustration of the DART spacecraft approaching two asteroids; it will crash into the smaller one to try to change how this space rock orbits its larger companion. NASA/Johns Hopkins APL/Steve Gribben hide caption
In a first test of its planetary defense efforts, NASA's going to shove an asteroid
Digital generated image of cut out male head multilayered with covid-19 cells inside on blue background. Andriy Onufriyenko/Getty Images hide caption
Young people line up to receive shots of the Sinovac COVID-19 vaccine in Phnom Penh, Cambodia, one of several Asian nations whose vaccination rates are now among the world's best. Heng Sinith/AP hide caption
This illustration shows NASA's DART spacecraft and the Italian Space Agency's (ASI) LICIACube prior to impact at the Didymos binary system. NASA/Johns Hopkins, APL/Steve Gribben hide caption
Scene from Avengers: Infinity War where Thanos snaps while wearing the infinity gauntlet. Marvel Studios' Avengers: Infinity War hide caption
Science shows a massive Marvel plot hole: Thanos couldn't have snapped with a glove
Sea levels in Guyana are rising several times faster than the global average. High tides sometimes spill over the seawall that is meant to protect the coastline. Ryan Kellman/NPR hide caption
Honey bees store the nutritious sweet treat in honeycomb. Anthony Wallace/AFP via Getty Images hide caption
The super blood moon rises over a residential area in New Delhi during a total lunar eclipse in May. Jewel Samad/AFP via Getty Images hide caption
While a thermometer will tell you if oil is hot enough for frying, scientists say the sound a wet chopstick makes when dipped into the oil will, too. Jason Kempin/Getty Images hide caption