It's a fantastic model of collaboration thinking partners who aren't echo chambers. I wonder how many of us have, or dare to have, such collaborators? Alice and George were very good at conflict. They saw it as thinking. So what does that kind of constructive conflict require? Well, first of all, it requires that we find people who are very different from ourselves. That means we have to resist the neurobiological drive, which means that we really prefer people mostly like ourselves, and it means we have to seek out people with different backgrounds, different disciplines, different ways of thinking and different experience, and find ways to engage with them. That requires a lot of patience and a lot of energy. And the more I've thought about this, the more I think, really, that that's a kind of love. Because you simply won't commit that kind of energy and time if you don't really care. And it also means that we have to be prepared to change our minds. Alice's daughter told me that every time Alice went head-to-head with a fellow scientist, they made her think and think and think again.