claim: James, Viscount Severn is the oldest grandchild of Queen Elizabeth II.
evidence: Coda Wave Interferometry is an ultrasound technique for detection of weak and local changes in complex inhomogeneous media .. ultrasound technique. Ultrasound. Sound waves that travel through a medium are scattered multiple times by heterogeneities in the medium , or boundaries in a sample of limited size , and generate slowly decaying waves , called coda waves .. Despite their noisy and chaotic appearance , coda waves are highly repeatable such that if no change occurs in the medium over time , the waveforms are identical .. If a change occurs , such as a crack in the medium , the change in the multiple scattered waves will result in an observable change in the coda waves .