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Air Pollution Linked to Depression and Suicide 
The analysis of global records has shown a pronounced association between levels of air pollution and the mental health issues of depression and suicide. Indeed, polluted air is coming under scrutiny for a range of suspected negative impacts on people and their health. The Guardian has the details: https://www.theguardian.com/environment/2019/dec/18/depression-and-suicide-linked-to-air-pollution-in-new-global-study

Human Intelligence – Threatened By CO2?
In all the preceding millennia of human existence, atmospheric carbon dioxide levels have been considerably lower than today. Now, researchers are asking whether the levels of CO2 we are breathing might be effecting intelligence, a topic The Atlantic explores: https://www.theatlantic.com/science/archive/2019/12/carbon-dioxide-pollution-making-people-dumber-heres-what-we-know/603826/

Flu Vaccine Sparks Immune System Attack on Tumors 
Working off clues provided by other research, scientists recently tried injecting flu vaccine into malignant tumors. The result was that the immune system was incited to attack the tumor. Ars Technica has more on this encouraging development: https://arstechnica.com/science/2019/12/injecting-the-flu-vaccine-into-a-tumor-gets-the-immune-system-to-attack-it/