What happened to my face

Glad you're and thankyou for another physics lesson.

You should definitely head to Bondi and hand out with the lifeguards (I'm addicted to that show atm)

And... could maybe help explain how an isochronous curve works on a horizontal plain? (I'm a mountain bike trail builder and I'd love to understand some of the physics of berms in particular. 

Thankyou again for continuing to be awesome :D