Being an astronaut is a wonderful career. I feel very privileged. But what I really hope for young people is that they find a career they're passionate about, something that's challenging and worthwhile.

I think of it as a good opportunity to let, in particular, school kids know that this job and other interesting jobs in science and engineering are open to anyone who works hard in school and gets a good education and studies math and science. And that it's not just for a select group of people.

The ISS operates as the 'anchor customer' in low earth orbit to support new commercial space services, including delivery of cargo and, before long, crew transportation services.

These robotic arms, provided by Canada, have been invaluable in allowing us to build, maintain, and repair space structures, and I've been very fortunate to have gotten to operate them.