Question

The flowers in the photo stand out in sharp focus, but the background is a soft blur. That means that the camera lens that took the photo was set for a
small aperture and a low f/ratio small aperture and a high f/ratio large aperture and a low f/ratio large aperture and a high f/ratio
9) My older son Ben is quite a good juggler. He got in some trouble once when he left a set of clear acrylic juggling balls, like these, in the back end of our Ford Escort station wagon while it was parked for a long time in the sun. Why do you suppose I got a little mad at him? The juggling balls
got hot and

Answer 1

This one seems to be about my old nemesises "depth of focus" and "depth of field" in imaging systems in optics.

9) I can't see the the balls, but sounds as though B has left some lenses in the Escort, and the lenses have focussed a bit of sunlight+infrared+uv on to something and made things very warm indeed, and possibly dangerous.
Or, the heat in the E simply started to melt the balls, to a gunge.