Teddy Roosevelt said, "Comparison is the thief of joy." Is that always true?

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Links: • Social comparison study by two Princeton researchers

• Jealousy spikes stress hormones

• Pride gives us a strong, positive emotional response

• The four-minute mile

• 12-year-old skateboarder lands a 1080-degree spin

• The Rise of Superman by Steven Kotler

• JoshShear.com: On comparison