When the cardinals vote, they burn their ballots and send up smoke to signal their decision: white smoke to show they have ...

Advocates for women's ordination sent pink smoke signals Wednesday over the Vatican to demand that women be allowed to be priests and participate in a conclave. Even the White House got involved ...

Black smoke rose from the Sistine Chapel chimney at 11:50 a.m. local time, signaling that the latest vote was inconclusive. It was the second ballot of the conclave’s first full day and the ...

Fluorescence lidar technology enables a better determination of the origin of particles in the atmosphere. The method can ...