Efflorescence is the white powdery substance you might notice on basement walls, concrete surfaces, or masonry materials. It forms when water moves through a porous material like concrete or brick, ...

Three people were briefly hospitalized after a "white powdery substance" exploded in a Colorado home on Tuesday. Arapahoe County deputies say a family found a small container on the front porch of ...

An air traveler's recent mistake led to her luggage getting flagged by the Transportation Security Administration (TSA). After making it to her destination, Anna McKay of Phoenix, Arizona, noticed her ...

Add Yahoo as a preferred source to see more of our stories on Google. Law enforcement agencies are investigating after a "powdery substance" was delivered Sunday night to Ohio Secretary of State Frank ...

JEFFERSON CITY, Mo. -- The FBI and Postal Service are investigating suspicious mail containing a white powder substance that was sent to election offices in at least 16 states this week, according to ...