April 22, 2011 12:14 pm New Steam Engine May Revolutionize Transportation A company is testing a steam engine they say is compact, powerful and more efficient than a internal combustion engine. US & World Videos 2:03 Does Shakira still believe in love following Gerard Piqué split? 1:36 O.J. Simpson's cause of death revealed 25:57 WATCH: ‘Changing Climate' highlights the Philly-area residents who are combatting climate change 2:36 Super dad makes Mario-themed obstacle course for son's birthday 4:17 How the Philadelphia Union became the sustainability champs of the MLS