"If they see a bag of pens or something at the thrift store and it's full of pharmaceutical pens, it might have value," the poster said. The poster holds a pen from the thrift store.

Heather has been selling things on eBay for nearly 20 years and has learned to keep an eye out for certain types of pen.

Number columns allow you to take large numbers and subtract one from another. Find out more in this Bitesize Primary KS2 Maths guide.

News about Food Prices and Supply, including commentary and archival articles published in The New York Times.

The UN Security Council is the premier global body for maintaining international peace and security, but it faces steady calls for reform to better meet twenty-first-century challenges.

The U.S. shopper found a rare designer 1980s Tatlin sofa in a thrift store—worth thousands but bought for just $350.

Operating profit is the total earnings from a company's core business operations excluding deductions of interest and tax.

Learn how to compare sets of data with this BBC Bitesize Maths article. For students between the ages of 11 and 14.