This video is 57-minutes long.
The YouTube description:
"A look at the science behind nature's beautiful crystalline art, delivered by Kenneth Libbrecht as part of Perimeter Institute's Public Lecture Series in 2012. Perimeter Institute (charitable registration number 88981 4323 RR0001) is the world’s largest independent research hub devoted to theoretical physics, created to foster breakthroughs in the fundamental understanding of our universe, from the smallest particles to the entire cosmos. The Perimeter Institute Public Lecture Series is made possible in part by the support of donors like you. Be part of the equation: https://perimeterinstitute.ca/inspiri..."