They signified the technical breakthrough that made Dolly the sheep possible.

"A lot of people see this as the future and are working toward the technical breakthroughs to make these things possible."

And every technical breakthrough seems to double or triple the cost.

Of course, once a technical breakthrough is achieved it cannot be hidden away forever.

Only in a dying culture can any important technical breakthrough be truly lost.

The Soviet Union did have some extraordinary technical breakthroughs of their own.

Might this signal that the Americans have made another technical breakthrough?

Over the ages, key technical breakthroughs have often had no direct link to pure science.

But for each singer, finding his true voice involved self-knowledge rather than a technical breakthrough.

"The emotion at the point of technical breakthrough is better than wine, women and song put together," he said.