A new iPhone app will turn the device into a hearing aid. SoundAMP will run you $9.99 to amplify the sound around you. Once you activate the app, you plug in a set of earphones and a large slider appears in the display for you to set the volume. If you miss something, you can tap the screen and re-listen to the last 5 or 30 seconds of sound- a conversation, a loud speaker announcement, a lecture, etc.