An excellent examination of an intriguing scientific phenomenon. Extremely well written with fantastic quotes and commentary. The expert commentary is particularly outstanding, informative, interesting and provides relevant context. The brief explanatory video is a welcome addition and nice touch. The scientific terminology is readily accessible and clearly understandable. While the full study is not available, the Abstract which is, also makes for splendid additional reading. A decidedly worthwhile read even even for those with only a passing interest in the referenced subject matter. Five stars! Critic's note: (and for further reading) The piece makes reference on two occasions to: "Earlier this century, the first experimental evidence for this effect was seen in gyroscopes orbiting the Earth, whose orientation was dragged in the direction of the Earth's spin." This reference is to: The Stanford University Gravity Probe B Mission of 2004 - 2005 More here: https://en.wikipedia.org/wiki/Gravity_Probe_B?wprov=sfla1