: Despite the name, "spring tides"—which occur twice each lunar month—have nothing to do with the season ; the name comes from the water "springing forth" during a new or full moon.

"See?" Leo pointed. "The robin is back. That means spring, right?"

Early spring is the best time to hear "plant acoustics." As drought-stressed trees begin drawing water from the thawing ground, scientists have recorded the ultrasonic clicks of microscopic bubbles bursting inside their water-conducting vessels (a process called cavitation).

The official arrival of spring in the Northern Hemisphere is marked by the , which typically falls on March 19, 20, or 21.

In spring, the Eiffel Tower grows by about six inches. The iron structure expands when heated by the sun, and spring’s rising temperatures cause the metal to swell.