If it's difficult enough that the mythbusters failed to make it, doesn't that suggest that this isn't in fact "run of the mill 5th grade science"?
Seriously tho i don’t meant to diss the kids science fair project (which is what the story is about fwiw). It’s cool. But it’s just not more headline worthy than the MIT project linked in my reply - now THAT is awesome.
https://en.m.wikipedia.org/wiki/Concentrated_solar_power
I think we do this quite a lot already.
It’s called a magnifying glass.