I learned that moral courage is harder than physical courage.

These rules may seem simple enough, but it will require great morale and physical courage to adhere to them. But if carried out in the strict sense of the word it will surely lead to a greater success than could otherwise be attained.

It is curious that physical courage should be so common in the world and moral courage so rare.

Ski jumping is just 10 per cent physical, 90 per cent mental. Some people can't do that. It's not just to do with the fear at the top. It takes a lot of guts to go off the top, but it takes 100 times more courage to jump off the end.

I have reached the conclusion that those who have physical courage also have moral courage. Physical courage is a great test.

Physical bravery is an animal instinct; moral bravery is much higher and truer courage.

Moral courage is higher and a rarer virtue than physical courage.

It's now possible to play and take lessons from any place of the world. The concept of physical distance doesn't exist in the online world, and that is so cool!

On the tennis court, one needs a cool temperament, tremendous ball sense, reflexes, speed, hand-eye co-ordination, power, timing and peak physical fitness. Off the court, the player and support team need skills in planning, execution, travel, an ability to raise funds when needed, and several other talents.

As for me, I want to have fun while I'm working. Now not everyone thinks physics is fun, but I do. I think experimental physics is especially fun, because not only do you get to solve puzzles about the universe or on Earth, there are really cool toys in the lab.

I loved couriers. You had this transfer of physical information happening throughout the city and the world. Someone picking up the package, putting it in a bag, going somewhere, taking it out of the bag, giving it to someone else. I thought that was so cool. I wanted to map it, to see that flow on a big screen.

Success in math and the hard sciences, far from being a matter of gender, is almost entirely dependent on culture - a culture that teaches girls math isn't cool and no one will date them if they excel in physics.

Once you acknowledge that human brains are basically made of atoms and acknowledge that atoms are governed by simple laws of physics, then there is no reasoning principle why computers couldn't do anything that people are doing, and we don't really see any evidence that this is not the case.

We want the digital world to bend to your physical life, your real emotional life as a person, and we don't want you to bend to computers.

I have nothing against investment banking, but it's like massaging money rather than creating money. If you're in physics, you create inventions, you create lasers, you create transistors, computers, GPS.

When I was growing up, I had lots of smart classmates that were girls, but none of us were really pushed into math or computers or anything like that. Girls took AP history and AP English and AP European history. And boys took calculus and physics.

If we can make computers more intelligent - and I want to be careful of AI hype - and understand the world and the environment better, it can make life so much better for many of us. Just as the Industrial Revolution freed up a lot of humanity from physical drudgery I think AI has the potential to free up humanity from a lot of the mental drudgery.

Bitcoin is not an actual physical coin, and if computers are shut down, you can't buy or sell them. That's why nothing will ever replace gold and silver coins themselves, and all investors should have them at home or in a safe deposit box.

Computers are great tools, but they need to be applied to the physical world.

The new information technology... Internet and e-mail... have practically eliminated the physical costs of communications.

If you want to make big improvements in communication, my advice is - hire physicists, not communications people from normal companies and never believe what advertising companies tell you about 'data' unless you can independently verify it.

In analyzing what made the Golden Century of 1870 to 1970 possible, it becomes clear that four physical infrastructure technologies provided the underlying foundation for growth: energy, transportation, health and sanitation, and communication.

I'm a very physical person. I'm very tactile. I wrestled in college, so a lot of my communication with the world comes through physicality - what I take in and what I put out there.

We're moving into an era when things are dematerialised and much more holographic. Floating above the physical world and the geographic map, there's another landscape that's constantly changing - something like a cloud - of communication, information, exchange and commerce.