For Little Brother Nazir, having a Big Brother isn't just about having someone to explore and be active with.

It's about having someone challenge him to think, solve and be curious about the big questions in life.

Whether it's playing mind-bending puzzle games, reading books on self-improvement, or asking big questions about the nature of the cosmos, his Big Brother Dan is ready to join him in every pursuit.

And together, there's no adventure too big for this pair to tackle.