Some molecules or particles are too large or too hydrophilic to pass through a lipid bilayer. Other molecules could pass through the bilayer but must be transported rapidly in such large numbers that channel-type transport is impractical.
Vanna White Has the World's Most G-Rated Wardrobe Malfunction on 'Wheel of Fortune'. by 11:56 AM PST, December 11, 2015. Playing Vanna White Has the World's Most G-Rated Wardrobe Malfunction on 'Wheel of Fortune'. Vanna White found herself in a sticky situation during Thursday's Wheel of Fortune. While walking across the stage, the hostess, unbeknownst to her, brought part of the set with her when a prop gift got caught on the bottom of her dress.
2. Vanna White's favorite 'Wheel of Fortune' fail is a masturbation joke. To celebrate the show's 6,000th episode, earlier in 2014, Parade magazine had a long interview with Vanna White in which she was asked about the contestants flubs that end up in viral YouTube videos.