We need more more precise measurements of Big G

In 2019 Junfei Wu et al. published a comprehensive paper titled Progress in Precise Measurements of the Gravitational Constant (full text) from which I cite the last paragraph:

Another reasonable explanation for the discrepancy of G measurements is that there is still some unknown physics. In 2015, Anderson et al. claimed that the recent values of G varied sinusoidally with a period of about 5.9 years by analyzing the measurement results from 1982 and they also proposed that one possible reason was the activities of the Earth's core. Then Schlamminger et al. corrected the acquisition time of these measurement results but not found remarkable correlation. In 2017, Parra proposed that the time‐varying phenomenon was potentially caused by the sun's dragging effect. In fact, these hypotheses cannot be absolutely confirmed or denied now primarily due to the low precision of G measurement, so the G measurement with higher precision and more methods is still needed. We hope that more people could be involved in G measurement and we believe that if more efforts and more experiments can be involved, the “problem of G” can be solved in the near future.

I couldn't agree more :)

Wu, J., Li, Q., Liu, J., Xue, C., Yang, S., Shao, C., Tu, L., Hu, Z., Luo, J., Progress in Precise Measurements of the Gravitational Constant. ANNALEN DER PHYSIK 2019, 531, 1900013. https://doi.org/10.1002/andp.201900013