The brain can read these patterns and learn them. In this way, we can time music or specific tasks to be performed, for example, one second after a signal. Even though not all the clock mechanisms in humans are known, biological clocks share a property with all human-built and non-living clocks: they are limited by quantum mechanics. Even the simple pendulum is limited by quantum theory.
He was one of the greatest scientists the world has ever known, yet if I had to convey the essence of Albert Einstein in a single word, I would choose simplicity. Perhaps an anecdote will help. Once, caught in a downpour, he took off his hat and held it under his coat. Asked why, he explained, with admirable logic, that the rain would damage the hat, but his hair would be none the worse for its wetting. This knack for going instinctively to the heart of a matter was the secret of his major scientific discoveries- this and his extraordinary feeling for beauty.
Gravity is one of the four fundamental forces of nature. It is an immediate fact of
everyday experience, yet it presents us with some of the deepest theoretical and
experimental challenges in contemporary physics. Gravity is the weakest of the four
fundamental forces, but, because it is a universal attraction between all forms of
energy, it governs the structure of matter on the largest scales of space and time,
including the structure of the universe itself
Look at what happens around us. A child who smiles, a nightingale that sings, an ily that opens: all move. Every shadow, even an immobile one, is due to moving light.
Every mountain is kept in place by moving electrons. Every star owes its formation and its shine to motion of matter and radiation. Also, the darkness of the night sky* is due to motion: it results from the expansion of space.
A few years ago, while testing a superconducting ceramic disc by rotating it above powerful electromagnets, Podkletnov noticed something extremely strange. Small objects above the disc seemed to lose weight, as if they were being shielded from the pull of Planet Earth. The weight reduction was small - around 2 percent - but nothing like this had ever been observed before. If the shielding effect could be refined and intensified, the implications would be immense. In fact, practical, affordable gravity nullification could change our lives more radically than the invention of the internal combustion engine.
You don’t have to be a scientist to get excited about breakthroughs in theoretical physics. Discoveries such as gravitational waves and the Higgs boson can inspire wonder at the complex beauty of the universe no matter how little you really understand them.
Physicists today believe that matter is made up of twelve fundamental particles - quarks and leptons - that have no substructure and cannot be broken down into smaller particles. Quarks and leptons interact via four forces to make the universe we know today.