To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Share Embed Share URL Video File Node URL Embed Code <iframe title="MRC TV video player" width="640" height="360" src="https://www.mrctv.org/embed/33041" allowfullscreen></iframe> Harry Smith, host of CBS’s “The Early Show,” warned viewers July 25 about what might be “lurking inside” granite countertops: radioactivity.