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Ultimately, the direction that Mueller's testimony takes may come down to the special counsel himself and how he decides to engage with both Democrats and Republicans. Mueller comes to Capitol Hill a reluctant witness. He's largely an enigma to the public, despite the central and outsized role he has played in Trump's presidency.The reluctant witnessMueller and his team have said nearly nothing in the two years since he was appointed special counsel, preferring to let the special counsel's indictments and 511

What we're looking at: Erupting volcanoes spew hazardous sulfur dioxide gas. If conditions are right, that gas and other pollutants can settle with moisture and dust to create a haze called volcanic smog, or "vog," with tiny sulfuric acid droplets.If it rains when it's voggy, you get acid rain.What causes it: We've had vog already, but mostly south of the island over the ocean, because trade winds have largely been keeping it away.But the winds are expected to calm down Thursday and Friday, possibly allowing the vog to settle over more of the island.It should rain over the Big Island on Thursday into Saturday. The vog's sulfuric acid droplets would fall, too -- thus, acid rain.How it impacts people: Vog seems to be the more immediate health concern. At higher concentrations, vog can cause headaches and irritation to the lungs and eyes, the University of Hawaii at Hilo saysHigh levels of acidic particles in vog "can induce asthma attacks, especially in adolescents, and can also impede the ability of the upper respiratory tract to remove other potentially harmful particles," the USGS says.For people with asthma and other respiratory problems, "the effects are much more serious, causing a tightening of the airways in the lungs and making it very difficult to breathe," the university says.But it adds: "There's been no clear evidence that vog causes lingering damage to normally healthy individuals."How acid rain affects human health is more complicated.Walking in acid rain or swimming in a lake affected by it "is no more dangerous to humans than walking in normal rain or swimming in non-acidic lakes," the Environmental Protection Agency says.But acid rain can contaminate household water supplies by leaching metals from building and plumbing materials, the USGS says. That includes rooftop rainwater-catchment systems that Hawaii residents use for drinking water. 1912

We have an allegiance to San Marcos, she said. "We love it. We love Cal State San Marcos. We love the trails. It’s a fabulous place to live, and we just want to keep it that way." 184

U.S. News and World Report’s 2018 Best High School rankings by state are based on states with most gold- or silver-medal high schools. 134

Trump's Sunday morning Twitter post was one of more than a half-dozen supporters' tweets the President retweeted Sunday before 8:30 a.m. 136

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