Electronics & Semiconductors

A better pen-and-ink system for drawing flexible circuits

Conductive ink is a great tool for printing flexible electronic circuits on surfaces. But these inks can be costly, they do not work on some materials, and devices to apply them can plug up. Now, scientists report in ACS ...

Engineering

3D pen-in-air aims for professional heights

In the 3D marketplace, would a small, lightweight 3D printing pen, enabling doodling in the air with precision, really take off? Here's an indication: a Kickstarter project offering a 3D pen that is small, light and able ...

Pennsylvania

The Commonwealth of Pennsylvania i/ˌpɛnsɨlˈveɪnjə/ is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to the east. The state's four most populous cities are Philadelphia, Pittsburgh, Allentown, and Erie. The state capital is Harrisburg.

Pennsylvania has 51 miles (82 km) of coastline along Lake Erie and 57 miles (92 km) of shoreline along the Delaware Estuary. As of the 2000, and 2010 census, Pennsylvania has one of the largest European American populations and a strong African American population.

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