How did free wi-fi help unlock Hanoi wet mark
<p><em>Traditional wet markets, the main source of fresh food for the citizens of Hanoi, Vietnam have been tricky to study because of a lack of traceability and sales registration system—but a new study shows how researchers used free Wi-fi to track the flow of over 600,000 people through the markets. </em></p>
Source: eurekalert.org
