>> it's boric acid and ethyl alcohol. when they came in, we set up the decontamination tents and had them wash off. >> reporter: these same chemicals were responsible for this fireball nearly four years ago at a children's museum in reno. 13 were burned. >> and steve osunsami live with us tonight, as well. steve, you just pointed out there that we've seen these kinds of accidents before. but officials say this was a first-year teacher who was conducting this experiment? >> reporter: that's right, david. and authorities are crediting school administrators with doing the right thing and moving quickly. this school is expected to reopen tomorrow. david? >> steve, thank you. we turn to hawaii tonight, and this evening, new images coming in of the volcano emergency on the big island. look at this. geologists releasing video showing the lava lake created by the kilauea volcano. they say it could erupt in the coming days, sending rock and ash into the air. tonight, nearly 40 homes and structures have now been destroyed. about 2,000 people have now been evacuated. there is also new video