We use all of our brains. 100 percent of our brain is basically in use 100 percent of the time. The whole 10 percent business is malarkey. But what if it weren't? And what if unlocking the other 90 percent essentially turned you into a superhero? This is what happens to Scarlett Johansson's character in Luc Besson's Lucy, after some mysterious drug that she was smuggling in her abdomen gets kicked into her blood stream. Either way, ScarJo beats up a lot of dudes! The film opens on August 8 and looks pretty awesome, even if you'll have to check 90 percent of your brain at the door.