NOTHING new?

Since I last looked at it - NOT all that long ago - it has lain on the bedside table.
Yesterday, on a whim, (how else) I prowled "U-tube" and ye Web on the subject.  All manner of Youtube clips on pros. Vs. cons. and an item in Cycling News© which quoth thusly:-

"During the last decade, an alternative chainring has become popular: the oval. From a distance, oval and round chainrings look nearly the same. But if you step closer and view two bikes with each, the difference in the profile is clear.
What is the purpose of oval chainrings and are they a natural evolution to gaining better performance and mitigating against injury?" 

They then proceed to explain the point.

The "last decade" you say?  Long decade OR which rock were you under for almost a century?  ?

B T W for those kids of, say, 50-60 or younger; 7/6 ≈ 37.5P

Unfortunately Sellotape© predated lamination.

Extra - just for me for comparison after "a bit of a fiddle about".