This is an animation describing John Mankin’s “sandwitch” concept, that was recently presented at the National Press Club in Washington DC by the NSS, and is part of the recent NSSO Study. You can read more at the NSS; www.nss.org . This animation, and all derivatives are ©Mafic Studios, and permission must be obtained to use the content in any for-profit scenario. A 1080 HD version is available.