I used my aviation contacts to open a travel agency. I used to book Caribbean flights.

I always enjoyed politics. I worked at the White House recently, primarily for the First Lady. Because of my experience running my travel agency, I was in charge of the files she kept on the Travel Office.

You travel across the country, you visit departments, you give talks, you talk about the work at your laboratory - what's going on, what the opportunities are there - you talk about your own research.

As the President has indicated, my life has been a life of travel - for 60 years constantly moving over the wide world on journeys which first and last have taken me to 83 countries, and, what is more significant, to most of them again and again.

To travel hopefully is better than to arrive.