Most likely there is a logical explanation, but I'm curious how many people from HN read the article and immediately hope that it wasn't a scientific reason at all.
Extract of comments: ... In case this is not a joke ... It happens only at daytime ... so it's probably dew to the vibrations caused by the public ... because the friction between stone and glass is small.
Note: An important detail is that it's not a "perfect circle", it's really only a half turn, so gravity is a possible explanation.
6 comments
[ 3.1 ms ] story [ 36.5 ms ] threadI mean, seriously, WAT.
Most likely there is a logical explanation, but I'm curious how many people from HN read the article and immediately hope that it wasn't a scientific reason at all.
Extract of comments: ... In case this is not a joke ... It happens only at daytime ... so it's probably dew to the vibrations caused by the public ... because the friction between stone and glass is small.
Note: An important detail is that it's not a "perfect circle", it's really only a half turn, so gravity is a possible explanation.
Another thread: https://news.ycombinator.com/item?id=5927620 (3 points, 4 ours ago, 4 comments)