HOUSTON, Nov. 2 (UPI) -- Researchers at Rice University in Houston are using a technology that converts glycerin to ethanol.

HOUSTON, June 25 (UPI) -- U.S. scientists have developed a technology designed to convert waste glycerin from biodiesel plants into ethanol, another popular biofuel.

GUATAMALA CITY, Guatemala, March 20 (UPI) -- Guatemalan authorities have arrested four people suspected of ordering the killings of three lawmakers from El Salvador that were visiting Guatemala.

GUATEMALA CITY, March 8 (UPI) -- Three Guatemalan security officials have resigned amid an ongoing investigation into the deaths of four police officers, Prensa Libre reported Thursday.

GUATEMALA CITY, Feb. 26 (UPI) -- Four Guatemalan police officers who were arrested in connection with the deaths of three Salvadoran lawmakers have been killed in jail.

SAN SALVADOR, El Salvador, Feb. 22 (UPI) -- Salvadoran police are confounded by the murders of lawmakers who were found dead in a car in Guatemala, La Prensa Grafica reported Thursday.

GUATEMALA CITY, Feb. 20 (UPI) -- Police have found the bodies of three politicians from El Salvador in a car in Guatemala's capital, La Prensa Grafica reported Tuesday.

TEMECULA, Calif., March 14 (UPI) -- A Guadalajara, Mexico-based group representing agave growers, tequila producers and distributors is arguing with a U.S. man over the name Temecula.