. >> you guys know steve spangler is out here. you can't see him. he just launched something into the air like that far from my head. >> we thought you were blocking yourself from the sun, but it's steve, of course. >> no. it's really just to make sure nothing random falls on my head while i'm out here. if you see me dart off camera -- >> we know he's warming up. >> i call it misbehaving. >> it is nice out here, though, right? temperatures got up to the low 90s today, mostly sunny skies, beautiful day to be out here. let's take a live look outside. there you have it. we're right over downtown denver. on top of the 9news building you can see would have got calm flags out front, just a couple clouds on the horizon, not a whole lot going on out there. we're waiting for the equinox or autumnal equinox. it's actually coming up on thursday. you might think we should see more fall-like temperatures, but that's not the case today and might not be the case after thursday. regardless the specific time is coming up and what happens on the autumnal equinox is th

. >>> today steve spangler's stem lesson is all about the science of high voltage. know what's in this box? but there's also a commitment to this community. see, at xcel energy this is our hometown. so, we're not just about making a living here, we're about living here. aw, i wish i had wings. in our community, we're always delivering. xcel energy. >>> it is a steve spangler science day. i'm seeing all of this electrical equipment. it's not part of my contract to get electrocuted. >> it is part of my contract. so we'll go to management afterwards and discuss who is going to do what. we're talking electricity and creativity and innovation. creativity is doing things differently for the sake of doing things differently. electric lesson. this is plugged into the wall, so 120 volts of electricity, and this, someday we'll show our kids and go this is an antique called an incandescent light bulb. there will be kids that go where's the l.e.d.? we go a long, long time ago it looked like this. let me plug this in and show you what 120 volts of electricity looks like through

it's a steve spangler science day. >> that's exactly it. slime before, you've never seen slime like this. i promise you you've never seen the application for slime where you're going to go that was school. here's basically how you make slime. the recipe is all over the place. we've done it on 9news.com many times. it's a management of elmer's glue and i add water and add the secret ingredient is this stuff right here called borax. if you buy a box of borax, it's good for life. put some bo stir it around and this borax water is what you now add to the glue. when you mix around and everything, becky, reach in and grab it out, there it is. is that the greatest? >> oh, feels so, so lovely. >> that is slime, so it's perfect. i have a slime that's a little bit different. watch this. >> okay. >> this one has been colored like this. >> black. >> let me pull this out here so you can kind of see. so this 1 looks a little you can see the difference. yours when we get a manage net close to -- a magnet close to it does nothing. when you get a magnet clo