The paper explores the preference for negative neutrino mass in cosmological data, particularly from the cosmic microwave background (CMB) and baryon acoustic oscillations (BAO). The most precise determination of the sum of neutrino masses from cosmological data, derived from CMB and BAO analyses, favors a value below the minimum inferred from neutrino flavor oscillation experiments. This preference is attributed to larger than expected lensing of the CMB in both two- and four-point lensing statistics. The analysis shows that this preference is robust to changes in likelihoods of BAO and CMB optical depth data. The excess clustering is not easily explained by changes to the expansion history and is likely distinct from the preference for dynamical dark energy in DESI BAO data. Future data, including Planck CMB with mock DESI 5-year data, may impact these results. The paper concludes that the preference for negative neutrino mass is likely to persist even as more cosmological data is collected. The analysis highlights the importance of understanding the data driving the current neutrino mass measurement and identifying data that could clarify the situation without waiting for future CMB measurements. The results suggest that the preference for negative neutrino mass is not due to a single measurement but is driven by the four-point lensing information in the CMB. The analysis also shows that the preference for negative neutrino mass is not resolved by changing the expansion history at late times. The paper discusses the potential impact of future data on the measurement of neutrino mass and the physical origin of the expected signal. The results indicate that the preference for negative neutrino mass is likely to persist, and future data may not significantly alter this conclusion. The paper emphasizes the importance of understanding the relationship between cosmic surveys and lab-based neutrino experiments.The paper explores the preference for negative neutrino mass in cosmological data, particularly from the cosmic microwave background (CMB) and baryon acoustic oscillations (BAO). The most precise determination of the sum of neutrino masses from cosmological data, derived from CMB and BAO analyses, favors a value below the minimum inferred from neutrino flavor oscillation experiments. This preference is attributed to larger than expected lensing of the CMB in both two- and four-point lensing statistics. The analysis shows that this preference is robust to changes in likelihoods of BAO and CMB optical depth data. The excess clustering is not easily explained by changes to the expansion history and is likely distinct from the preference for dynamical dark energy in DESI BAO data. Future data, including Planck CMB with mock DESI 5-year data, may impact these results. The paper concludes that the preference for negative neutrino mass is likely to persist even as more cosmological data is collected. The analysis highlights the importance of understanding the data driving the current neutrino mass measurement and identifying data that could clarify the situation without waiting for future CMB measurements. The results suggest that the preference for negative neutrino mass is not due to a single measurement but is driven by the four-point lensing information in the CMB. The analysis also shows that the preference for negative neutrino mass is not resolved by changing the expansion history at late times. The paper discusses the potential impact of future data on the measurement of neutrino mass and the physical origin of the expected signal. The results indicate that the preference for negative neutrino mass is likely to persist, and future data may not significantly alter this conclusion. The paper emphasizes the importance of understanding the relationship between cosmic surveys and lab-based neutrino experiments.