suffices. that's really important. that's a good thing for the prosecution, and what we don't know, of course, is how many jurors had an issue with this, how concerned they are about it, and whether this will assuage those concerns but it was a good instruction for the prosecution. >> we'll be watching closely. thanks so much. still ahead, why elon musk is grilling apple's ceo tim cook, not just about his claim that apple is threatening to oust twitter from its app store. we'll tell you straight ahead. ♪ we all have a purpose in life - a “why.”