The relationship between big tech and journalism has grown increasingly complex, exemplified by the impact of Jeff Bezos’ ownership of the Washington Post, leading to the resignations of several longtime Post staffers. Nobel Peace Prize winning journalist, Maria Ressa says it’s a “very difficult time for journalism in America,” and that the pressure to compromise to power “will always come.” Drawing from her experience as a journalist in the Philippines and enduring harassment under Rodrigo Duterte’s government, Ressa cautions Americans that “without journalism, you have no democracy.”

Epidemiological studies have linked dirty air to dementia and other brain disorders. Now researchers are trying to determine how pollutants do their damage, and how much harm they cause.

A recent study found high levels of two potentially deadly chemicals in humans' urine, raising concerns about tire pollution.