My father was not only a planetary scientist and a great popularizer of science, but he thought very deeply about the world. He was a scholar, he studied history. He taught a class in critical thinking, and he was very, very aware of the directions we might go.

Dad was a difference maker. He reached out to people. He took them by the awe and wonder we feel over the most important questions we can think to imagine. He pulled them away from blind faith, away from pseudoscience, toward a deeper, richer understanding of the universe.

Life in space is impossible,' we're warned, and amidst the hypnotic beauty of these heavens, we become painfully aware of what a hostile environment space is, how unforgiving, how unsympathetic to human desires.

Astonishingly powerful and poignant, 'Gravity' is the rarest of rares: a space survival film informed by a genuine reverence for the awe-inspiring cosmos we inhabit.

When people laugh at social media it's because they don't understand how much work is involved. It's like creating any kind of content.

If future generations are to remember us more with gratitude than sorrow, we must achieve more than just the miracles of technology. We must also leave them a glimpse of the world as it was created, not just as it looked when we got through with it.

As soon as a critical mass of people in the world gained access to devices with high-end graphics and Internet connectivity, the rise of games like 'Fortnite' became inevitable.

The cliche was always that 'everybody's a critic,' but it becomes truer every day. Long before reviews appear in the traditional outlets, you can now usually discover - somewhere in the thickets of the Internet - reactions to shows from people who've seen them in previews.