More than 5,000 years ago, in ancient Egypt, a mixture of silica, lime, copper, and an alkali was heated, resulting in a bright blue compound known as calcium copper silicate. This striking, vibrant ...

IN THE NEXT TIME THAT YOU MAIL A LETTER, YOU MIGHT WANT TO LOOK CLOSELY AT YOUR STAMPS. ACCORDING TO THE U.S. POSTAL SERVICE, THEY’RE SEEING AN INCREASE IN COUNTERFEIT STAMPS. SO HOW DO YOU KNOW IF ...

After increasing seven times over the last five years, the cost of a First-Class stamp and other mailing services held steady this week as the United States Postal Service raised the cost of its ...

“If you’re applying for a credit card in person, your bank may ask you to sign the application in blue ink.” That’s because blue ink is harder to reproduce and easier to spot on paper that ...

Languages: English. The United States Postal Service (USPS) has unveiled a new love-themed stamp ahead of Valentine's Day next month. The new stamp is the latest in USPS's of popular Love series ...