Universa Investments Senior Scientific Advisor Nassim Taleb says the stock market is way too overvalued given current interest rates, and the road back to normal will be “very painful for some.” Taleb spoke exclusively to Bloomberg’s Sonali Basak at an investor day in Miami on Thursday. Earlier, Universa Investments told clients that ballooning debts across the global economy are poised to wreak havoc on markets rivaling the Great Depression.