States Iowa and South Dakota emerge as new hot spots for US cases of the virus as colleges reopen and an annual motorcycle rally takes place.
With pressure growing in many countries for more measures to restart the economy, politicians also are trying to boost funding for research into a vaccine for Covid-19 which many scientists warn could take much longer than a few months.
Public health authorities have determined that technology is crucial to apps that will alert people when they have been close to people who have tested positive for the novel coronavirus.
Sweat lodges are typically built low to the ground, with frames made of saplings that are covered with animal hides, blankets or even tarps to keep in the steam.
Idaho-bound single engine Pilatus PC-12 with 12 people on board crashed on Saturday, shortly after taking off from Chamberlain, about 225 kilometers west of Sioux Falls, authorities said.
Several Midwestern states grapple with swollen rivers and breached or overtopped levees following heavy rain and snowmelt. Three people have died and at least one person is missing as a result of the flooding.
The expansion has faced fierce opposition from environmental groups, American Indian tribes and some landowners.
Researchers say stone tools and broken mastodon bones unearthed in California show humans might have reached the Americas about 130,000 years ago, ten times earlier than previously thought.
One of the strongest earthquakes rattled Oklahoma on Saturday, leading to a declaration of a state of emergency in Pawnee and the immediate closure of 35 wastewater disposal wells.
While Hillary Clinton has pronounced herself as the Democratic nominee for the US presidential race, Bernie Sanders wants the fight to continue.
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