— An underreported trend continues: Energy-related carbon-dioxide emissions in the United States in the first quarter of the year were at their lowest level since 1992. Much credit goes to cheap natural gas, lower oil use, and a warmer winter.

— An Australian billionaire is planning to clone dinosaurs.

— A day in the life of a drone pilot.

— Studies find that roughly 1 percent of papers published in scientific journals each year turn out to be fraudulent. One researcher says its time to take this problem seriously.

— Why the Amish population is exploding.

— Patent schematics aren't quite as beautiful as they used to be.