We heard and read about the probabilistic echo.

What branch of science could this be from and where and when we wondered.

We were caught brush in hand, with a suspiciously empty canvass.

Through the windows of the building opposite, we saw them hovering with erasable markers over a suspiciously empty whiteboard all day long!

Downstairs, breakthrough ideas in medicine were being taken out of the oven, slightly overcooked.

It was a day that changed the world for the better for everyone. We only discovered that the next morning while biting into a crisp apple.