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The Italian experiment looked very carefully. One of the things they looked for was a modulation in the signal, a change over time. They wanted to see the number of flashes of light from DM hitting normal matter go up and down by a few percent, with a maximum in June and a minimum number in December. Why?
Imagine you are in a car, driving through a cloud of bugs. If you hold your hand out the window, a bunch of bugs will hit it (ewwww). Now if you throw a ball out the window into the direction of the car’s motion, it will hit more bugs, because it’s moving into the cloud faster. If you throw a ball behind you, then the ball will be moving slower relative to the bugs, and fewer bugs will hit the ball.
If the Earth is slamming into dark matter particles, then we should hit more when the Earth and solar system velocities are in the same direction, and hit fewer when the Earth is moving in the opposite direction of the solar system as a whole six months later. So not only should we see the number of hits go up and down every six months, but that oscillation must line up with the correct dates (June for the former, and December for the latter).
Particles of invisible "dark matter" have been detected deep inside a mountain in Italy, a collaboration of Italian and Chinese physicists claims.
Update: Dagnappit, I should read the other science blogs before writing mine! Cosmic Variance has this story as well, and is also skeptical of the result being dark matter, and also agrees that the modulation is real and probably something interesting. However, he’s a bit more forceful about it than I am.