The new “Life Jacket Flotation” video explains buoyancy — the tendency of a body to float or sink in water. Viewers will also learn about the three basic types of flotation used in U.S. Coast Guard approved life jackets. Also featured are valuable tips on which body types are the most difficult to keep afloat. Learn more at bit.ly/2c9b2OM. Join USPS at bit.ly/2bQX2KS.