KRISTOPHER R. FARRUGGIA used to run a Web design company, but

WHAT could be the world

OVER the past few years, as venture capitalists poured money into solar companies and green technology start-ups, the mood in Silicon Valley resembled the sunny days of the dot-com boom in the late 1990s.

PHOTOVOLTAIC cells are already a familiar sight on rooftops. But one day, miniature cells may also be found in more unconventional places: power-generating windows, car sunroofs or even awnings.

LOCKHEED MARTIN is best known for building stealth fighters, satellites and other military equipment. But since late 2006 the company has taken on a different kind of enterprise

North Korea said Wednesday that it would start a uranium enrichment program, declaring for the first time that it intended to pursue a second project unless the United Nations lifted sanctions.

Calling the United Nations Security Council

To the Editor:

A utility in Missouri said Thursday that it was suspending its efforts to build a new nuclear reactor, making its proposed plant, Callaway 2, the first of the so-called nuclear renaissance reactors to fall by the wayside.

A long-awaited United Nations report that was presented Wednesday to senior Iraqi officials proposes several options for Kirkuk Province, including making it an autonomous region as a way to defuse simmering tensions between Kurds and Arabs over its oil wealth.