September 21, 2018, 10:21 a.m. by Matt Hickman
This path in Zwolle is paved with the equivalent of a half-million plastic bottle caps.
Power in the desert: solar towers will harness sunshine of southern Spain
November 24, 2008, 11:32 a.m.
A new project in Andalusia, Spain will power 11,000 homes.
Diesel cleans up its act
November 24, 2008, 10:53 a.m.
The new models are green, fuel-efficient and may be a better choice than a hybrid.
Ithaca, NY, wants to be America's 1st podcar city
November 23, 2008, 5:21 p.m.
Is the future now for podcars?
Do you have a zillion tabs open? It's OK
In 1972, a computer model predicted the end of the world — and we're on track
How older Americans got stuck in the suburbs
The 10 scariest roller coasters in the world
What would your city be like without cars? This city tried it
5 brilliant mathematicians and their impact on the modern world