What happens to drugs after they leave your body?

Swallowing a pill only seems to make it disappear. In reality, the drug eventually leaves your body and flows into waterways, where it can undergo further chemical transformations. And these downstream products aren't dead ...

Mapping street-level pollution estimates to reveal safer routes

The United Nations has identified improving the walkability and bikeability of cities as a key goal in efforts to reduce dependence on greenhouse gas–emitting automobiles and promote routine exercise for public health. ...

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