Q&A: In Ports Everywhere, It’s Push Versus Pull It’s more efficient for tugboats to nudge barges along, but some conditions require that the loads be towed. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:SpaceX successfully launches its heaviest satellite EVER into orbitMystery sea beast IDENTIFIED: Scientists find out what washed up in IndonesiaJerry Canterbury, Whose Paralysis Led to Informed Consent Laws, Is Dead at 78Wounded Troops Discharged for Misconduct Often Had PTSD or T.B.I.Feature: When the Lab Rat Is a SnakeProxima b SHOCK: 'Second Earth' COULD support alien life after all, scientists reveal