. >> they bring the stove top of drum, 55 foot high, retur run to turn it off and the other guy gets the next 55-gallon garbage can. >> it used to be, if you fire sprinklered your building, you got a real cut on your insurance. now if you fire sprinkler your building, insurance companies are thinking, the water damage is so high, maybe the rates should go up. >> it gets a minute to a minute and a half before that fills up. >> that's why they have four on a floor, and keep filling it off. one guy goes to turn it off and another guy goes to get the next drum, he brings it over and gets the next drum and pulse i pumz . >> i think that's all for today. i want to thank the building owners for letting us use their beautiful space. thank you all and we'll see you on the third thursday next month. [ ♪music ] [ ♪music ] >> you probably think you know all about the exploratorium. but have you ever been after dark? did you know there was a monthly party called after dark? science mixes with culture and adults mix with other adults. no kids allowed. every week there is a different theme. to tell