Harvard professor Daniel Lieberman theorizes that laziness is an evolutionary instinct. Hence, he says, many people choose escalators over stairs.
Harvard professor Daniel Lieberman theorizes that laziness is an evolutionary instinct. Hence, he says, many people choose escalators over stairs. Don Ryan Associated Press file
Harvard professor Daniel Lieberman theorizes that laziness is an evolutionary instinct. Hence, he says, many people choose escalators over stairs. Don Ryan Associated Press file

Harvard professor: ‘It is natural and normal to be physically lazy’

September 21, 2016 10:25 AM

UPDATED September 21, 2016 04:51 PM

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