In another interview she acknowledged that a casting had a failing yield strength and stated it should never have been shipped, according to the charging document.

Using a rough estimate of her foot size, her foot area comes out to be about If 50 kgs of weight were to be applied uniformly across this area, the compressive stress developed in the material would be The Yield strength of ordinary glass for compressive  stress is approximately , which is three orders of magnitude more than what Cinderella’s weight can produce, so we can safely conclude that any regular glass can sustain it.

This means that her shoes need to be made of glass that has a yield strength of at least .

Yes; it was on the cross that the pure sheaf of corn was bruised and the juices of the living vine pressed forth by the hand of Jehovah Himself, to yield strength and gladness to the hearts of His heavenly and earthly people forever.

And what we now like and prepare as foods are the things which have stood the test, and proved themselves able to yield strength and nourishment to the body.