michael kosta has more. >> water, h2o, warmed ice, whatever you call it, california's farmers are running turning to surprising methods to find more. >> can i get some por water please, thirsty. >> they're called douser, they claim to have supernatural water finding powers. thanks to climate change, desperate farmers have them booked sol aid-- solid. >> i'm booking out three to four weeks in advance. >> i thought it was bullshit but it has worked for me. >> it really does sound like bullshit so why do people believe in this? is de hydration playing tricks with their minds, to find out i head ford draught plagued california to meet one of these water witches or dousers. >> i'm larry berg and do i dousing. >> larry berg, who said white men can't douse. all right, okay. >> it's not really a joke, lack of water is really not a fun thing. rivers are drying up. my name is on the line. >> not really your name on the line. >> larry berg. >> but larry is right about claim at change. last summer 3 percent of california was facing extreme or exceptional draught. this summer, it's up to 88 percent. s

because this is all very confusing around important for us to figure out, michael kosta has volunteered to help us understand these complicated issues in a brand-new segment called underexplainer. ♪♪ >> boosters are here, and they could be a powerful weapon against covid. so let's get right to it with the basics. first, what's a boosterrer? great question. a booster is a shot of a vaccine that is not your first shot and in some cases not your second. to boost means to lift. i'll demonstrate. ball me! see, i'm boosting, or i'm lifting. now, to be clear, this is a basketball. it's not a booster shot. a basketball cannot be injected into is it bloodstream. next question, why do we need boosters? some studies have shown waning immunity over time. these studies were done by scientists studying people. also, the scientists were people as well but they were not in the study. that would be unethical. what are ethics? that's a topic for a different underexplainer. another important question, what is the controversy about the boosters? the controversy stems from a debate between the white house,

all right, when we come back, michael kosta looks for some-- and greta thunberg is some-- and greta thunberg is joining us on the show, so don't ♪ ♪ you twist it like this. ahh... ♪ ♪ ♪ ♪ my hygienist cleans with a round head. ♪ ♪ so does my oral-b my hygienist personalizes my cleaning. so does my oral-b oral-b delivers the wow of a professional clean feel every day. "dear evan hansen" is a beautiful reminder that nobody is entirely alone. ♪ on the outside always looking in ♪ ♪ will i ever be more than i've always been? ♪ every person will see themselves in this story. if you knew just how broken i am. i already know you and i love you. it's really hopeful and inspiring. stories like evan's help people feel seen. it's so full of life and a lot of happiness. ♪ waving through a window ♪ baaam. internet that doesn't miss a beat. that's cute, but my internet streams to my ride. adorable, but does yours block malware? nope. -it crushes it. pshh, mine's so fast, no one can catch me. big whoop! mine gives me a 4k streaming box. -for free! that's because you all have the same internet. xfinity xfi.