He speaks for the trees

Donald Culross Peattie strode through thousands of miles of American wilderness wearing a green Stetson hat, a coat and a tie. Around his neck hung a pair of binoculars and over his shoulder was a vasculum, the metal cylinder field botanists once used for carrying their plant specimens.
 

Guiding light

Q. My mom used to say that if I’m going to leave a room for just a few minutes, I should leave the lights on because it takes more energy to turn lights off and on in a short period of time than it does to just leave them on. Is that true?
 
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