BrainCo, a company developing electronic headbands that deliver student EEG data to a dashboard for educators, has raised $15 million. For many, this concept may be one of the creepiest in recent memory — and just in time for Halloween. The premise itself, however, is also a reminder of some sage advice from Scott McLeod, an associate professor of educational leadership at the University of Colorado Denver and the founder of CASTLE: When investing in tech and presented with a pitch, administrators should always start by asking, “How does this empower students to do amazing things that make a difference in the world?”