The belugas also blew bubble rings, but apparently not when they had more serious things to do: Males rarely did it ... “you can hardly think of anything more precious than air.” ...

But I think bubbles have different shapes ... which it isn't designed to do," Jim Covello, Goldman Sachs' head of global equity research, wrote in the report. But that hasn't stopped investors ...

Bubbles are among the tech sector's favourite ... top 5 highest-value public companies are tech companies. So what do you think is more overvalued? The average unicorn or tech IPO?