Main content
How thorium lit up the world
Chemistry Professor Andrea Sella of University College London explains how this radioactive chemical element brought "gas mantel" street lighting to cities a century ago.
(Picture: Gas street lighting; Credit: altanakin/Thinkstock)
Duration:
This clip is from
More clips from Business Daily
-
![]()
Should skincare products come with age restrictions?
Duration: 04:31
-
![]()
The 'soft girl' trend that celebrates women quitting work
Duration: 03:46
-
![]()
The musical star in space
Duration: 05:00
