My last conversation with Adrian Bejan ended on the notion that if design in nature is a universal principle of the material world, then freedom is the key variable that determines how efficiently designs can evolve over time.

FORBES: The Constructal Sessions, Part II: Freedom and Design

He was thanking Vint Cerf for making state-full edges a core design principle of the original web.

FORBES: The Link Between Scarce IP Addresses and the Centralization of the Internet

The study argued that managing biodiversity needs to be enshrined in the design stages of projects, especially if the principle of a 'net gain' in biodiversity is to be achieved.

BBC: Jobs or birds: Turning Rio rhetoric into reality

The danger of this happening will become acute on December 21st, when a Scottish businessman, Andrew Cubie, is due, at Mr Dewar's request, to publish a report about the future of university tuition fees, a subject which accident as much as design has elevated into a difference of high principle between Labour and the Lib Dems.

ECONOMIST: The Scottish play