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Visitors to the Grand Canyon may have been exposed to unsafe radiation levels, for almost two decades. George Rose / Getty Images

Grand Canyon visitors and employees who passed through the national park's museum collection building were exposed to radiation for nearly two decades, AZCentral reported Monday.

That's because, until last year, three five-gallon paint buckets filled with uranium ore were stored in the building, according to a Feb. 4 email sent out to all National Park Service employees by Grand Canyon safety, health and wellness manager Elston "Swede" Stephenson.

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The Goodfellow Air Force Base in San Angelo, Texas is near four Superfund sites. Don Barrett / Flickr

A site that the Trump administration proposed as a migrant detention center for unaccompanied children is contaminated with several pollutants that could harm the children's health, a report released by EarthJustice on Tuesday found.

In June 2018, former Defense Secretary Jim Mattis said that the government was preparing to house unaccompanied children at Goodfellow Air Force Base in San Angelo, Texas, as Reuters reported. However, EarthJustice said that the base was near four Superfund sites.

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Yellow scorpions have a poisonous, though not often deadly, sting. José Roberto Peruca / Flickr, CC BY 2.0

By Hamilton Coimbra Carvalho

I live in São Paulo, the biggest city in Brazil, home to some 12 million people—20 million if you count the outskirts, which have been sprawling for three decades.

That makes it a good place to observe the phenomenon I research: complex social problems. In academia, this concept refers to problems like corruption, crime and traffic—problems that, in practice, cannot be solved. They must simply be mitigated or managed.

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This narrow street, lined with parked cars but devoid of people, is both unwelcoming and unsafe for cyclists. Anne Lusk, CC BY-ND

By Anne Lusk

Designing for bikes has become a hallmark of forward-looking modern cities worldwide. Bike-friendly city ratings abound, and advocates promote cycling as a way to reduce problems ranging from air pollution to traffic deaths.

But urban cycling investments tend to focus on the needs of wealthy riders and neglect lower-income residents and people of color. This happens even though the majority of Americans who bike to work live in households that earn less than $10,000 yearly, and studies in lower-income neighborhoods in Brooklyn and Boston have found that the majority of bicyclists were non-white.

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Coldest wind chill. Valid ending Feb. 1, 2019 at 12 a.m. CST. National Weather Service

The upper midwest is bracing for some dangerously cold weather this week. Wind chills are expected to reach levels not seen since the 1990s in parts of Illinois, Minnesota, Iowa, Wisconsin and the Dakotas, the National Weather Service predicted.

Temperatures will dip 20 to 40 degrees below average Tuesday through Thursday, and wind chill temperatures could hit -60 degrees in the upper Midwest and -55 in the upper Mississippi Valley, U.S. News and World Report reported.

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Sunbathers are seen on Bondi Beach as temperatures soar in Sydney on Dec. 28, 2018. PETER PARKS / AFP / Getty Images

Australia is sweating through yet another record breaking heat wave, with the past four days among the country's 10 hottest days on record, the Bureau of Meteorology announced Tuesday.

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