i wanted to know what and where i could get some of the glass that they used. i know it's expensive, they said the small bit they had was $200+
or if there was any similar material that lets light and heat through but reflects it back on the other side
and if it could be made in a cone shape

the episode was on this morning in aus at 9:30 on foxtel, i cant find any details about it so im wondering if its a new one or a re-run of a really old one