videos don't play – New Horizons: a NASA Voyage to Pluto Review

I've used the app for two days on my iPad Air running iOS 8.4, but the videos don't play. On the other hand, a huge Congratulations to the New Horizons team on reaching Pluto!! The July 13 photo is really spectacular and of course historic.
Review by Jophus21029 on New Horizons: a NASA Voyage to Pluto.