His gift carried one condition. He said La Brea could only be used for scientific work.

VOA: special.2010.04.07

The book is considered the greatest scientific work ever written.

VOA: special.2011.06.01

Ivan Jimenez of the Missouri Botanical Garden says he likes the chance to talk about his work with people outside the scientific community.

VOA: special.2010.05.14

And he said her pioneering work for social and scientific improvements changed the lives of millions of developmentally disabled people all over the world.

VOA: special.2009.08.23

This is the product of work of several scientific, industrial and environmental agencies.

VOA: special.2009.05.11

Professor and researcher Elaine Fuchs says it's incredibly rewarding to work in scientific research.

VOA: standard.2010.03.29

But the scientists don't seem to mind. Ivan Jimenez of the Missouri Botanical Garden says he appreciates the chance to talk about his work with people outside the scientific community.

VOA: standard.2010.05.04