The basic components of the drug probably already existed in nature.

Could one create elements beyond uranium, even if they did not exist in nature?

It does not exist in nature, but for brief moments.

"You're creating something here that never exists in nature," he said.

This connection is powerful even though it does not exist in nature.

This is called the lie, a category that does not exist in nature.

It is a radioactive element that does not exist in nature.

The essential features of such a system already exist in nature.

The turkey you'll be eating could never exist in nature.

They know only a tiny percentage of what exists in nature.