This is because glass has the hardness of crystal materials while also having a disordered arrangement of molecules like a liquid.

VOA: special.2009.09.16

This is because diseases that infect beans can stay in the soil and infect the next bean crop.

VOA: special.2009.03.24

This is because people who live in Washington,D.C., have no voting representation in the United States Congress.

VOA: special.2009.03.20

This is because parents give resources,education and medical care to their boys before giving them to girls.

VOA: special.2010.06.16

This is because most fraternities and sororities are named after a series of Greek letters, such as Alpha Delta Pi or Sigma Phi.

VOA: special.2009.09.25

This is because oil well fires are extinguished,or put out, at the wellhead just above ground.

VOA: special.2009.03.22

This is because they have lost their homes and can no longer care for their animals.

VOA: special.2009.02.23

This is because orbital debris travels at speeds of thirty-two thousand kilometers an hour or more.

VOA: special.2009.04.01

She says this is because her parents taught her about the value of hard work.

VOA: special.2009.07.17

Their jobs have been limited. This is because the office is organized by pecking order.

VOA: special.2010.06.13

This is because it was against the law in England for women to act onstage.

VOA: special.2010.01.06

This is because many Americans believe two-dollar bills are lucky, so they keep them.

VOA: special.2010.11.15

This is because my father rolls up his sleeves and prepares to work hard.

VOA: special.2010.05.02

This is because their bodies have little or no resistance to the disease.

VOA: special.2010.04.20