As Ben Goldacre, author of Bad Science , explains, by randomly assigning people to one intervention or another and measuring the outcome in the same way across both groups, you can rule out alternative explanations for differences between groups
J Clin Invest 125:24582462 Lei Y, Wen H, Yu Y, Taxman DJ, Zhang L, Widman DG, Swanson KV, Wen KW, Damania B, Moore CB, Giguere PM, Siderovski DP, Hiscott J, Razani B, Semenkovich CF, Chen X, Ting JP (2012) The mitochondrial proteins NLRX1 and TUFM form a complex that regulates type I interferon and autophagy
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Each bar is worth $500 , which is a huge sum early in the game