Gravity leaps into quantum world
Researchers finally measure the subtle quantum effects of fourth fundamental force.

http://www.nature.com/nsu/020114/020114-8.html


I find this quite Intriguing ...
By following the progress of hundreds of ultracold neutrons (UCNs) falling from the top of the detector to the bottom, the team found that the particles exist only at certain heights. "They do not move continuously, but rather jump from one height to another as quantum theory predicts," says Nesvizhevsky.