NGL Energy Partners LP (NGL)

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When investors claim they can time market peaks and bottoms it's usually nonsense or perhaps a streak of random luck. Vanguard's famous founder John Bogle (recently RIP) has written that he hired many pricey Ivy League fund mangers over decades who claimed they could time markets or stocks.

But once those hotshots were on Vanguard's payroll and put to the acid test of managing money... they couldn't beat a coin-flip. That's one of many reasons Bogle --bless his soul -- popularized the modern Index fund.

Can anyone predict NGL's highs and lows? I'd like to see it done.