How was the yoke (in Episode 1) so big – CHRISTMAS LECTURES 2018

Question: How was the yoke (in Episode 1) so big
- Keywords:
  CHRISTMAS LECTURES,
  egg,
  yolk
Asked by anon-195349 to Gill on 27 Jan 2019.
- Gill Harrison answered on 27 Jan 2019:
  
  I guess it was because the egg was so big. If you look at a tiny egg the yolk is in proportion to the size.
  
  I’ve eaten an ostrich egg once (not all of it, we shared it between quite a few of us). That egg was massive, so the yolk was too.

Question: How was the yoke (in Episode 1) so big