Doctors and scientists have identified at least eighty other diseases in which the body attacks its own organs and cells.

VOA: special.2010.06.15

The Harlem Renaissance was a period in which black artists explored their culture and showed pride in their race.

VOA: special.2009.02.22

Rockman imagines a terrible future in which plants and animals must be sent into space to protect them from Earth's pollution.

VOA: special.2010.12.15

You can see the wisdom and experience in her face, which is very different from the baby's wondering expression.

VOA: special.2009.03.23

Mars has less gravity. My attempts to walk resulted in jumps and hops, which took me into the air.

VOA: special.2010.07.10

Jordan was the first stop on a Middle East trip in which he also visited Israel and the Palestinian territories.

VOA: special.2009.05.18

He said rock climbing is a high risk sport in which many people overestimate their abilities and underestimate the rock.

VOA: special.2009.12.09

Professor Gaechter says social order in general can be explained as a system in which individuals behave cooperatively and follow social rules.

VOA: special.2009.03.03

He reacted to the way in which his mother cared for him and his brother and sisters.

VOA: special.2009.03.15

It said all persons born or naturalized in the United States were citizens of the United States and of the state in which they lived.

VOA: special.2010.02.04

He was caught in a whirlpool which kept turning him around and around.

VOA: special.2011.05.28

He studies environments in which bees and other pollinating insects are threatened.

VOA: special.2011.05.25

It is the only private art collection in the United States that had one person design the building, the collection and the way in which the art is hung.

VOA: special.2009.01.11

"The Purdue Online Writing Lab is a sizeable collection of workshops,worksheets, instructional materials in both English language and in various genres in which students and people working in the world are expected to write."

VOA: special.2010.02.11