dr. shine: this is groundwater bubbling up from underground. whatapns is the iron, when is underground and there's no oxygen, it can stay dissolved. but once it comes up, it oxidizes, and essentiay what you're looking at is rust. you can see the mixing. here comes the acid mine water. you can see the line where it goes from orange to clear. and the question is, what's the amount of toxic heavy metals that are coming along with that rust? narrator: to gain a clearer understanding of where the metals are coming from, dr. shine and his team take samples of water at different points along tar creek. dr. shine: we will process these, take them back to the lab, and analyze them for heavy-metal content. narrator: back at the lab in boston, laurel schaider is evaluating the samples taken from tar creek using a mass spectrometer. woman: so we run the sample through, and it separates the metals based on their atomic mass. and then we're able to quantify the concentration of the metals in the samples. and

dr. king called it a shining moment. >> i know you're asking today how long will it take.ing how long will presidents blind the visions of men. how long? not long, because no lie with live forever. how long? not long. because the moral universe is long, but it bends towards justice. >> today the fight guess on for voter rights, for gay rights, for immigration rights. and today we remember these images. we remember how dr. king and so many others march peacefully hand in hand. we must continue that fight. thanks for watching. i'm al sharpton. "hardball" starts right now. >>> the mystery returns. let's play "hardball." >> good evening. i'm chris matthews in washington. let me start tonight with this. it's not over. i pick up the newspaper this morning thinking the mystery of flight 370 is dead and it comes screaming back to life again. somebody, some human being did something here. all this talk yesterday about some catastrophicnt

it is part of our ongoing effort to continue to point to this issue, to shine a bright light on this problem. drng, who is pastor of ebenezer radice church, said that of all the injustices, inequality and health care is the most shocking in the most inhumane. i agree with that. so it was a small price to pay to be handcuffed for a few hours. we were trying to dramatize the fact that there are a number of people -- some 600,000 georgians and more -- who were handcuffed to poverty, who could find away from poverty to the middle class if they could be a late of the fears and concerns of going to work every day without health care. it is quite ironic when you think about the push, if you will, of the gop, the emphasis on work and the ethics of work and the dignity of work. people really need to understand that what we're talking about expanding medicaid come a we are really talking about, in this instance, the working poor. these are people who go to work every day. we see them clean floors and they work in office buildings press it was the people who have floorscare -- they clean and office buildin

dr. seuss citing. this is "hardball." these don't look clean. [ doorbell rings ] the johnsons! stall them. first word... uh...chicken? hi, cascade kitchen counselor. stop stalling and start shining with cascade platinum packs. over time, platinum fights cloudy residue 3x better than the competing gel. it's so powerful it even helps keep the dishwasher sparkling. avoid embarrassing moments... at least for your dishes. cascade. beyond clean and shine every time. >>> 30 democratic senators held an all-night talk-a-thon. that sounds exciting. an all-night talk-a-thon on the floor of the senate to highlight the impacts of climate change. that 14 hours of climate change talk or as al gore calls it, a first date. you look hot but not as hot as the earth is getting. take a look at these charts. this is where our love can go. >> great. time for sideshow. the all nighter senate democrats finish yesterday morning. the highlight was yet another dr. seuss reading. it wasn't "green eggs and ham." this time it was "the lorax". next up funny man jimmy kimmal had rick perry on. despite being on home turf the initial reception was pretty icy. >> i thought here in austin you would get a favorable