Spiegel picks up stake in Berlin brain-train­ing start­up Neu­roNa­tion (Ven­ture Cap­i­tal Post): “Berlin-based brain-train­ing start­up Neu­roNa­tion has received a sev­en-fig­ure invest­ment from pub­lish­ing firm Spiegel.net (part of the largest Ger­man media group). The deal, which was done in part­ner­ship with accel­er­a­tor XLHealth, allowed Spiegel to take a 25% stake in the start­up, accord­ing to Ven­ture Village…According…