Could circular runways be the future of air travel? Aviation expert Henk Hesselink of the Netherlands Aerospace Centre believes so.
Seen on http://www.bbc.com/news/topics/742c0008-33a6-49ae-8e23-ad982ec6b740/worldhacks
Seen on http://www.bbc.com/news/topics/742c0008-33a6-49ae-8e23-ad982ec6b740/worldhacks