Wickr app aims to safeguard online privacy

Wickr co-founder Nico Sell is working toward "geek utopia," a world where people hold the power when it comes to who sees what they share on the Internet or from their phones.

DayStar to buy technology to make solar power available at night

DayStar Technologies has struck a deal to buy a company whose technology could solve a problem that has chilled the solar energy industry: How to make solar power available for electricity usage at night when the sun is gone.

Using math to design amazing mirrors

Mathematician Andrew Hicks was in his Drexel University office, puzzling over some problem he can no longer recall, when colleague Ron Perline walked in with a challenge. Fresh from his morning bicycle ride, Perline was unhappy ...