A Quote by Edward Witten
String theory is 21 st century physics that fell accidentally into the 20th century.
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Even before string theory, especially as physics developed in the 20th century, it turned out that the equations that really work in describing nature with the most generality and the greatest simplicity are very elegant and subtle.
The 19th century was a century of empires, the 20th century was a century of nation states. The 21st century will be a century of cities.
The 20th Century was the century of Aviation and the century of Globalization. The next century will be the century of Space.
The 19th century was the century of empires, the 20th was the century of nation states, and the 21st is the century of cities and mayors.
It has become part of the accepted wisdom to say that the twentieth century was the century of physics and the twenty-first century will be the century of biology.
D-Day represents the greatest achievement of the american people and system in the 20th century. It was the pivot point of the 20th century. It was the day on which the decision was made as to who was going to rule in this world in the second half of the 20th century. Is it going to be Nazism, is it going to be communism, or are the democracies going to prevail?
The 20th century was the century of war and blood. The 21st century is the century of dialogue.
The 20th century taught us how far unbridled evil can and will go when the world fails to confront it. It is time that we heed the lessons of the 20th century and stand up to these murderers. It is time that we end genocide in the 21st century.
I was really interested in 20th century communalism and alternative communities, the boom of communes in the 60s and 70s. That led me back to the 19th century. I was shocked to find what I would describe as far more utopian ideas in the 19th century than in the 20th century. Not only were the ideas so extreme, but surprising people were adopting them.
One layer was certainly 17th century. The 18th century in him is obvious. There was the 19th century, and a large slice, of course, of the 20th century; and another, curious layer which may possibly have been the 21st.
Inequality in the developed world fell for most of the 20th century; we can make it fall for most of the 21st century, too. But it won't happen without sustained pressure on politicians from electorates.
It is my opinion that the 21st century will be the century of play, and the heteroglossic activity of artists in the 20th century has been the forecast.
The 20th century was the time when the world turned to use of fossil fuels and the 21st century will be the century of the renewables.
It's fun to sentimentalize the 20th-century lifestyle and the 20th-century brain, but it helps nobody, it makes you look ancient, there's no going back, and you'd be miserable if you did.
There was engrained poetry and then when you look back at our history and in the 20th century, the last century, probably the greatest writers of the 20th century were Irish. It became our only weapon, was our poetry, our music.
Indeed, the history of 20th century physics was in large measure about how to avoid the infinities that crop up in particle theory and cosmology. The idea of point particles is convenient but leads to profound, puzzling troubles.
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