Some emigrated or fled; some (if they had leadership aspirations) were killed or imprisoned; and many may be keeping their heads low so as to avoid drawing attention from the current regime. Unfortunately.
They said “we compare outcomes for children who are similar across observable characteristics but differ in eligibility for intervention due to blood lead test results.” Economic status is observable, so ide guess it’s I caused; but I only read the abstract.
We previously knew about life in the hydrothermal vents. That was indeed the basis for the planned Europa exploration. but this is about life underneath the vents, and if I understand correctly, the way that life travels through cracks in the crust.
The most recent image is near-infrared light (per the captions), so the parts of the image that look brightest are where the most near-infrared light is. Also, it's a star nursery, so areas brightest are (I believe) where the new stars are forming. If they're the biggest source of near-infrared light in the area, that would explain the lighting angles.