An ETF that can trade all day is investing in an asset that rarely changes hands. Figuring out what it’s worth is a guessing game.

Elon Musk's space exploration business, SpaceX, got a lot of headlines late last year when it was valued at $350 billion -- a gain of more than $100 billion from its previous valuation, according

Addressing a hall of 4,500 people, Musk spoke live via video link about preserving German culture and protecting the German people.

The billionaire was received by cheers while addressing a rally for Alternative for Germany where he told attendees they shouldn’t be ashamed of their history.