Green show houses are appearing across the country, spreading a message about environmentally conscious building.

  The E.P.A. said the proposed California rules were made moot by the energy bill signed into law by President Bush on Wednesday.

  E.U. officials told leading automakers to make deep cuts in emissions or face fines that could reach billions of euros. But automakers promised a fight.

  Walter H. G. Lewin, a physics professor at M.I.T., has found devotees across the country with his online lectures.

  Astronauts and engineers spent Tuesday troubleshooting problems in space and on the ground.

  Alan Rabinowitz has persuaded dictatorships and democracies alike to protect their felines.

  ?Trumpery,?a play that opened this month in New York, explores a period teeming with religiosity and controversy.

  Scientists have found evidence of a peril that human ancestors encountered in their migrations out of Africa: tuberculosis.

  More than winter blahs, seasonal depression is recognized and treatable.

  Frederic Riccardi is an attack dog disguised as a health insurance counselor.

  Why is risky behavior so common among teenagers and what might be done to curtail it?

  A new book suggests that among other things, eating ice cream and cutting back on meat may help raise your fertility.

  Which came first: the order or the universe? And can science ever supply an answer?

  We and our machines are about to go through a rocky transition as the machines get smarter and take over more tasks.