They'll buy the 'pieces' they need from the supply companies then react them to form new chemicals.

But it has become harder to find new chemicals this way.

It did not take long for Tom to secure another supply of the new chemical.

"But when he gets to work testing his new chemical he'll be all right," decided Ned.

It was Tom's idea to try his new chemical first on this spot to watch the effect.

There, the new chemical must be coming in, the needle's going back up again to fully charged.

Are you not aware that new chemical and biological weapons have been introduced into the area?

More important, it is not clear that the new chemicals are effective.

At the same time, more than 80,000 new chemicals have been introduced into our environment since the 1950s.

What's more, only one in 10,000 new chemicals makes it all the way through the development pipeline.