Serena Williams, Mark Cuban invest $3 million in Mahmee, a digital support network for new moms

Tennis superstar and mom to a 22-month-old, Serena Williams has joined Mark Cuban to invest $3 million seed funding in Mahmee, a startup working toward filling the critical care gap in postpartum care. For those who've never given birth or who (count your blessings!) never had any mishaps in the hospital or afterwards, the weeks and months following childbirth can be extremely hard on the new mom, with estimates as high as one in five women suffering from postpartum depression or anxiety and about 9% of women experiencing post traumatic stress disorder (PTSD) following childbirth -- and those are just the mood and mental health disorders. Williams, who has a history of blood clots, ended up basically shouting at the doctors to give her a CT scan that saved her life.