Witness a fascinating experiment where a smoke bomb is placed inside snow overnight to see how long the smoke stays trapped.

VATICAN CITY – All eyes are on the Sistine Chapel and a chimney installed on the roof that will produce smoke signals at the selection of a pope. Steeped in Catholic tradition, smoke has been used ...

The following submission has been lightly edited. No other preventable health threat in America causes as many serious illnesses as smoking, according to public health research. It is within our power ...