What is the 60 million year old dinosaur egg?

I'm intrigued by the mention of a 60 million year old dinosaur egg. Could you elaborate on its origin, preservation, and significance in the context of paleontology? What techniques have been employed to authenticate its authenticity and age? How does it compare to other fossilized dinosaur eggs discovered thus far? Lastly, what insights does this discovery offer into the reproductive biology and behavior of dinosaurs?