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

VOA: special.2010.04.07

I did not work only a few hours each day -- no banker's hours for me.

VOA: special.2010.11.28

Also,in Darwin's time, the age of the Earth was estimated only in the millions of years too short a time some said for evolution to work.

VOA: special.2009.12.01

For about ten years, she could only find work in other countries.

VOA: special.2009.06.07

"This phone will work only for 11 days, when we are near the Earth, but it will be switched off later."

VOA: standard.2010.06.02