And there are two kinds. Most people of European or African ancestry have the "wet" kind: thick and sticky.

VOA: special.2010.03.31

Scientists recently studied the effects of mechanical thinning on two kinds of pecan trees in the southeastern United States.

VOA: special.2009.11.10

In a new study, scientists in the United States tested vaccines made with two kinds of inactivated virus.

VOA: special.2010.07.12

Satellite images followed the travels of two kinds of seabirds: the Corys shearwaters and the Balearic shearwaters.

VOA: special.2010.03.02

And unlike a machine, the skin-to-skin contact provides two kinds of warmth physical and emotional.

VOA: special.2009.05.25

This week, the Obamas said they had narrowed their dog search to two kinds.

VOA: special.2009.01.16

The drugs are of two kinds. A doctor must order these medicines for patients.

VOA: special.2009.09.15

Asbestos has been linked to serious health problems, including two kinds of cancer.

VOA: special.2009.11.17

They say modern automobile windshields block two kinds of ultraviolet radiation.

VOA: special.2010.07.06

The first involves two kinds of Asian carp, bighead and silver.

VOA: special.2009.12.15

The researchers say two kinds of alcohol drinking affect health.

VOA: special.2009.09.08

Today,we will tell about two kinds of dinosaurs.

VOA: special.2010.03.16

Two kinds of mosquitoes carry chikungunya fever.

VOA: special.2009.04.13

More than two-hundred kinds of songbirds also stop in Cape May on their way to Central and South America.

VOA: special.2009.06.01