Don’t sit down in the middle of the woods. If you’re lost in the plot or blocked, retrace your steps to where you went wrong. Then take the other road. And/or change the person. Change the tense. Change the opening page.

While I’m on stage, you are all my guests, because that’s sort of the unsaid agreement. While you’re my guest, if something bad happens on stage, I often think of Julia Child, “Oh, the chicken’s fallen on the floor! Yes. Oh, well pick it up and put it right back.” And you know what? Everybody’s with you. […] So whatever you practice for on the engineering side that fails is all right, because we have a greater purpose. The greater purpose is that we’re communing together and we want this moment to be really special for all of us. Because otherwise, why bother to have come at all? It’s not about proving anything. It’s about sharing something.

There's a term that gets thrown around a lot – keyboard warrior. It's used to refer to someone who makes aggressive or abusive posts online, often anonymously. I like the name. In my mind, when I read something especially horrific on my feed, I imagine it's written by a lone person unacquainted with personal hygiene practices, dressed in a poorly fitted super hero costume – one that is baggy in all the wrong places.

You cannot tell from appearances how things will go. Sometimes imagination makes things out far worse than they are; yet without imagination not much can be done. Those people who are imaginative see many more dangers than perhaps exist; certainly many more than will happen; but then they must also pray to be given that extra courage to carry this far-reaching imagination.

At the age of 21, as a Moeid, I believed that behind every universal phenomenon there must be beauty and simplicity in its description. This belief remains true today.

My science family came from all over the world, and members were of varied backgrounds, cultures, and abilities. The diversity in this "small world" I worked in daily provided the most stimulating environment, with many challenges and much optimism. Over the years, my research group has had close to 150 graduate students, postdoctoral fellows, and visiting associates. Many of them are now in leading academic, industrial and governmental positions. Working with such minds in a village of science has been the most rewarding experience – Caltech was the right place for me.

The great singer Um Kulthum (actually named Kawkab Elsharq – a superstar of the East) had a major influence on my appreciation of music. On the first Thursday of each month we listened to Um Kulthum's concert – "waslats" (three songs) – for more than three hours. During all of my study years in Egypt, the music of this unique figure gave me a special happiness, and her voice was often in the background while I was studying mathematics, chemistry… etc. After three decades I still have the same feeling and passion for her music.