The birth of science as we know it arguably began with Isaac Newton's formulation of the laws of gravitation and motion. It is no exaggeration to say that physics was reborn in the early 20th-century with the twin revolutions of quantum mechanics and the theory of relativity. Paul Davies
Suppose that 'Unsolved Mysteries' called you with news of a long-lost identical twin. Would that suddenly make you less of a person, less of an individual? It is hard to see how. So, why would a clone be different? Your clone would be raised in a different era by different people - like the lost identical twin, only younger than you. Nathan Myhrvold
The great leaders of the second world war alliance, Franklin Roosevelt and Winston Churchill, understood the twin sides of destruction and salvation. Their war aims were not only to defeat fascism, but to create a world of shared prosperity. Jeffrey Sachs
The special relationship between twins is that, if there's anyone else in the world that's going to get or be the confidant that you need, it's an identical twin. Sam Underwood
A lot of people say, 'Wow, you're a single father of twin boys, that's crazy!' Two toddlers can get hectic, but I wouldn't change it for anything. Every day they teach me different things. The love is there. When you have a two-year-old saying every other hour, 'Papi, te amo. Papi, I love you,' it can't get better. Ricky Martin