The pre stress bar′s real inter force is obtained by solving an inverse problem of structural vibration.

Maybe we drag ourselves to the local bar to hang out with some friends and eat, drink, and watch the news on TV – which adds its own layer of stress – hoping our feelings will just disappear.

If you have ever had the unfortunate incident of losing a cell phone - maybe accidentally leaving it in a bar - you probably know the frantic stress that can come with searching for the device.