1 For example, flywheels are used in reciprocating engines because the energy source, torque from the engine, is intermittent. 2  Delivering energy at rates beyond the ability of a continuous energy source.
CongresswomanTammy Duckworth is a new mom. She gave birth to a baby girl named Abigail Tuesday. It is the first child for the 46-year-old Duckworth and her husband Bryan. Because of her age and injuries as an Iraq War veteran, Duckworth's pregnancy was considered high-risk. Go Search
Image copyright Getty Images Image caption Mrs Duckworth had her first daughter at 47, while she was serving in the House US senator and Iraq war veteran Tammy Duckworth has announced that she is expecting a baby girl shortly after she turns 50 in April. The news means she will be the first US senator to give birth while in office. Only nine other female have had babies while serving in Congress - all when sitting in the House, not the Senate. She is already the first ever disabled woman elected to the Senate, having lost both her legs while serving as a US army helicopter pilot.