![The Economist Radio (All audio) show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/026/794/small/the-economist-all-audio.jpg)
Summary: This week: how optical navigation can help a bomb find its target without GPS. Researchers at MIT are investigating super-slippery surfaces. Also, why computers are replacing manpower in port security. Kenneth Cukier hosts
Summary: This week: how optical navigation can help a bomb find its target without GPS. Researchers at MIT are investigating super-slippery surfaces. Also, why computers are replacing manpower in port security. Kenneth Cukier hosts