Nuclear fusion of light elements like hydrogen or helium would permit approaching the speed of light. It seems very attractive to refuel your space ships where the fuel is.

Rocket scientists agree that we have about reached the limit of our ability to travel in space using chemical rockets. To achieve anything near the speed of light we will need a new energy source and a new propellant. Nuclear fission is not an option.

In the 1950s, the average person saw science as something that solved problems. With the advent of nuclear weapons and pollution, the idealistic aura around scientific research has been replaced by cynicism.

As a kid, I was obsessed with space. Well, I was obsessed with nuclear science too, to a point, but before that, I was obsessed with space, and I was really excited about, you know, being an astronaut and designing rockets, which was something that was always exciting to me.

Pride for me has always been about holding a personal vigil within your own relationship, with nuclear being under the queer umbrella or being an ally wherever you land.

As a nuclear power - as the only nuclear power to have used a nuclear weapon - the United States has a moral responsibility to act.

A nuclear power reactor is just a fancy way of boiling water.

All the waste in a year from a nuclear power plant can be stored under a desk.

The safest nuclear power or energy policy is to realize 'zero nuclear power.'

We should remember that there are nations which meet more than 30 to 60% of their power requirements through the nuclear power system.

Nuclear power is a young technology - there's so much more to be discovered. That's what makes it so exciting to me. Yes, there are problems, but innovative people are going to be able to come up with solutions and bring the technology to its full potential.

Denuclearization and the lasting peace on the Korean peninsula cannot be abandoned or delayed, as they are the historical assignment.

Smiling is very important. If we are not able to smile, then the world will not have peace. It is not by going out for a demonstration against nuclear missiles that we can bring about peace. It is with our capacity of smiling, breathing, and being peace that we can make peace.

What could become a danger to world peace is Iran's nuclear program and the country's open threat to annihilate Israel.

International peace and security depend on certain taboos that are easily recognized when they are broken. It can be more important for an intervention to take place because nuclear or chemical or biological weapons are used as opposed to just measuring how many people are killed.

When we think of the major threats to our national security, the first to come to mind are nuclear proliferation, rogue states and global terrorism. But another kind of threat lurks beyond our shores, one from nature, not humans - an avian flu pandemic.

I can tell you one thing, Iran is closer to developing nuclear weapons today than it was a week ago, or a month ago or a year ago. It's just moving on with its efforts.

The more powerful a technology greater care should be used to benefit fro it. India should not be left behind the world. From the past revolution of nuclear technology we saw how it could destruct and at the same time were useful for medical science.

I've been focused on detecting nuclear terrorism at ports, in cargo containers, and I developed and built detectors that are extremely cheap and also very sensitive. My other big development is a system to produce medical isotopes that are injected into patients and used to diagnose and treat cancer.

Enclosed by a sand berm four miles around and 160 feet high, the Baghdad Nuclear Research Facility entombs what remains of reactors bombed by Israel in 1981 and the United States in 1991. It has stored industrial and medical wastes, along with spent reactor fuel.

The growth of technology is such that it is not possible today for a nuclear physicist to switch into medical physics without training. The field is now much more technical. More training is needed to do the job.

When I entered medical physics in 1958 there were fewer than 100 in the U.S. and I could see many opportunities to apply my knowledge of nuclear physics.

My U.N. five-point plan focuses on preventing proliferation, strengthening the legal regime, and ensuring nuclear safety and security - an effort that was given good momentum by the Nuclear Security Summit held in Seoul earlier this year. The world is over-armed, and peace is underfunded.

We have a legal and moral obligation to rid our world of nuclear tests and nuclear weapons. When we put an end to nuclear tests, we get closer to eliminating all nuclear weapons. A world free of nuclear weapons will be safer and more prosperous.