The age of the most recent common ancestor (MRCA) for mtDNA, on the basis of the maximum distance between two humans (5.82 × 10-3 substitutions per site between the Africans Mkamba and San), is ...

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Katherine Haan, MBA, is a Senior Staff Writer for Forbes Advisor and a former financial advisor turned international bestselling author and business coach. For more than a decade, she’s helped small ...

For better or worse, the first time I picked up a flat iron was in middle school, so it’s safe to say I’ve tried many throughout my life (so far). As I’ve gotten older, I’ve learned which flat irons ...