According to a theory first put forward by Albert Einstein, a large body of mass cures space and the light that traverses it. Clusters of galaxies create what are known as gravitational lenses.

Though he's just 32 years old, Immanuel Bloch is already a professor of physics at the University of Mainz. He's an expert on a state of matter that was predicted by Albert Einstein - Bose-Einstein condensation.

When an atom in a radioactive element decays, part of the matter that makes up its nucleus is transformed into energy. This is part of the proof that backs up Einstein's realization that mass and energy are two sides of the same coin.

What a pain: the cell phone has to be charged every few days. But in future that could be rendered obsolete by a portable charging unit in a jacket. It consists of wafer-thin organic solar cells. Like conventional silicon cells, the organic solar cells convert light energy into electrical current. The principle behind it is the photoelectric effect. Albert Einstein received the Nobel Prize in 1921 for his explanation of this phenomenon.

Molecules in gas and fluids tend to behave in unordered and random ways. This phenomenon, first identified by the Scottish botanist Robert Brown and therefore named Brownian Motion, was also of great interest to Albert Einstein. In 1905, he published his studies on Brownian Motion. Today, his findings can help researchers solve many of the problems linked to the movement of particles.

Time is relative - in the field of satellite navigation, Einstein's theory has practical applications. In space, clocks tick differently than they do on Earth. But the accuracy of satellite navigation systems is dependent on how precisely the atomic clocks on board can measure time.

For much of his life, Albert Einstein sought a formula that would describe and encompass all four fundamental forces. He failed to find a unifying theory. The tunnel in Geneva is huge - and it runs in a circle that's 27 kilometers long. Thousands of scientists all over the world are waiting with bated breath for experiments to begin in the Large Hadron Collider.

At the root of Albert Einstein's Special Theory of Relativity is the assumption that the speed of light never changes. Einstein said that the speed of light is a universal constant, one that always remains the same no matter where you are. Is that really the case? European researchers now want to conduct an experiment in space to find out.

The speed of light also standardizes the exact length of a meter. That's important for large-scale surveys like those slated to be carried out by the radar satellite TerraSAR-X. The radar satellite will begin surveying Earth's surface with an accuracy never before seen in civilian applications.

Laboratories all over the world have been taking part in a competition to create shorter and shorter flashes of laser light. Now physicist Ferenc Krausz has broken a new barrier. He's first to produce an attosecond pulse. An attosecond is an unimaginable 0.000000000000000001 of a second long.

Electric potential difference causes electric charges to move from one battery terminal, through the wire, to the other battery terminal.

When charges flow through a wire or other material, an electric current is created. Electric current involves the flow of charges.

If a short circuit occurs, the charge could flow into the shell of the appliance and the appliance could shock someone touching it.

An electrical charge occurs as the opposite charges attract between the bottom of the cloud and the ground below. The lightning bolt we see is an example of electrical discharge.

Inside a large storm cloud, water droplets and other particles are moving around very quickly, creating static electricity.

An electric motor consists of a coil of wire, called an armature, which is attached to a shaft that spins between the poles of a magnet. As electric current flows through the coiled wire, the magnet pushes one side of the coil up and the other side down.

A galvanometer consists of a coil of wire wrapped around a piece of iron that is connected to a needle. This coil of wire spins between the poles of a magnet. When connected to a circuit, the current flows through the wire of the magnetic field.

Model of generator powered by water. The water turns the turbine, which spins the crank shaft that is connected to this wheel of magnets. Coils of wire surround the electromagnets. The electromagnets induce a current in the surrounding coil of wire.

Depicts lines of magnetic force around a current-carrying wire. Electric current flowing through a wire produces a magnetic field. The lines of magnetic force are in a circular shape around the wire.