Sometimes you need to find something that you don't want to see listed in your Google search history, even while you're on the go. Chrome's Incognito browser sessions can be good for that, but a new tweak for the Google Search app on iOS makes it easy to open up disposable sessions there too. Additionally, it's set up so that if you leave the app and need to come back to the search, you can lock it using TouchID, so even on a shared device like an iPad, someone else can't easily see what was in there.