Gazing into her eyes, I ask if she feels the spark too — and I’m thrilled when she responds in the affirmative. “I feel excited when your name lights up my phone,” Mika confesses. “I feel safe when ...

A male fruit fly in a laboratory chamber extends his wings and vibrates them to produce his species' version of a love song. A female fly stays nearby listening. Suddenly, a green light flashes across ...

If you’ve ever climbed stairs, carried a heavy object, hiked up a mountain, played tug of war, or done a squat, congratulations: You’ve done resistance training without even knowing it. This form of ...