It is impossible to make a perpetual motion machine, you’ll waste your time if you try.

It is possible to write a book of poetry that will sell 10 million copies.

It is unlikely, it probably won’t happen, but it is possible.

Science and innovation and creativity engage with the possible. Possible means “might.” It takes persistence to stick it out when we’re not sure.

Once certainty arrives, it becomes an engineering problem.

After the first fusion reactor is shown to work at any scale, we’ll know it can be done. Now the hard work is simply making it work better. Most organizations do this sort of work. Chipping, filing, refining.

Before you get to work, it’s worth deciding which hat you’re being asked to wear… pursuing the possible or optimizing the certain.