My friend John was diagnosed with Alzheimer’s. He’d lived in our building for about 40 years. He knew everyone and knew all the best gossip about them. In the last few weeks of his life, he became this scared, confused, little boy crying in his bed all the time. I kept wishing I could have the old John back. I think I wrote Artemis & the Astronaut just so I could give Artemis back her Henri.