Clean Cities
The collapse of Angkor holds a lesson for today’s cities
"Complex infrastructural networks provide critical services to cities but can be vulnerable to external stressors, including climatic variability."
Calling a cab to whisk household trash away
What if you could call a taxi to take your rubbish away? In some places you can.
Cigarette butts mixed in asphalt can have surprising benefits
Mixing discarded cigarette butts into asphalt makes road surfaces more robust and less heat-absorbent.
Cleaning up China’s rivers will come at great costs
China's government says it wants to clean up the country's rivers, many of which have become cesspools of pollution.
Algae cultivated on rooftops could help feed millions
The green algae come in several edible forms from flavored energy drinks to pasta.
A tiny device can purify water in a matter of minutes
What if you could purify water with a device the size of a postage stamp? Now you can.