The big rewards (and the big agita) come from stocks like BABA, CYBR, GPRO, CELG, and GILD. But they don’t provide a good night’s sleep every night. That’s why I also own BRKA and Vanguard’s VFIAX, Vanguard’s low cost (0.05%) S&P index fund. Diversification is a half-way free lunch — unless you also own stuff […]