This is the point on BBC Stargazing Live where Brian Cox held up the “front-of-the-envelope” calculation, done by our very own Chris Lintott and Becky Smethurst, which measured the age of the Universe from the supernovae discovered by volunteers on Snapshot Supernova. Brilliant!
Daily Zooniverse 
Can we see the calculation on the front of the envelope?
Zoom on envelope please! 🙂