Lines in windshield

[William13]

Today while cleaning my windows, I noted thin lines vertically oriented in the windshield. There were two perfectly straight in the exact middle with about ten more every few inches. I expect these are manufacturing artifacts between the panes as they were glued together.
Anyone else? Any ideas? Is my windshield about to crack?

 

[aaronw]

I noticed similar lines on the glass on my model S since I got it. Hopefully they will go away over time. I still see them even after having applied a glass rain treatment.