By Elizabeth Royte
Why do weeping willows weep?
— Clay Wilwol, Frankfort, Kentucky
The droopy willow has been an oft-cited metaphor for sorrow since biblical times. ("By the rivers of Babylon ... we wept [and] hanged our harps upon the willows," Psalms 137.) During World War I, Claude Monet painted a famous series of weepers to symbolize the French nation in mourning. But why the hangdog expression? "They're depressed?" suggests Frank
Santamour, eminent tree geneticist at Washington, D.C.'s National Arboretum, before confessing, "No one knows why. Their branches have never been studied at the cellular level." Despite the mysterious sagging boughs, one thing's certain: It's a tree that's been known to make people weep. Willows may look harmless as their leafy tendrils sway lugubriously in
the breeze, but beneath the ground they're all business. "Their fibrous roots are extremely aggressive," explains Nick Gawel, a plant DNA expert at Tennessee State University. "They can ruin your septic system and your pipes. They're a disaster!"
Why are moths drawn to light and what do they get out of it?
— Emily Allen, Waco, Texas
Despite the old adage, "like a moth to a flame," moths aren't the only insects that gravitate toward light; they're simply more active at night than wasps and beetles and thus appear more lamp-obsessed. That said, the moth, specifically the
male moth, is attracted to an illuminated lightbulb for the sad but simple reason that it thinks it's the Moon. For roughly 150 million years, the visually impaired lepidopterans relied on the giant orb to help them navigate in a straight line, always keeping the Moon's rays at a constant angle during their nightly mating flights — flying a more or
less steady course until they caught the scent of a female perched on a nearby leaf. But moth history took an unfortunate twist when the incandescent lamp arrived on the scene in 1879. "Moths will never forgive Thomas Edison," says Cornell University entomologist Cole Gilbert, noting that chaos ensued as the nocturnal creatures began mistaking lightbulbs
for the Moon. Unfortunately, flying so close to these surrogate moons makes it nearly impossible for a moth to maintain a straight course, so it must constantly correct its bearing. "Before you know it," says Gilbert, "the poor guy is fluttering around in circles." Relief comes only when the hapless moth resigns itself to a celibate night on a strange
porch, waiting until dawn, when it can find its way home — or fly indoors and exact sweet revenge on your sweaters.
A past Wild File column explained the difference between a stream and a creek. But what distinguishes a pond from a lake?
— Bob Wilson, Atlanta, Georgia
Not a thing, at least not officially. According to the experts at the U.S. Board on Geographic Names, whose job it is to approve place names that appear on federal maps, all "natural bodies of inland water" are lakes — regardless of size. In other words, "lake" is the Board's generic term. But we don't live in a generic world, and in deference to
that happy fact, the Board recognizes 54 different varieties of lakes, including basins, backwaters, and yes, ponds. Among the more obscure entries on the list are the charco, an intermittent pool found in Oregon and Texas; Utah's guzzler, a flooded area close to a stream; and Central Park's northernmost body of water, the Meer. Ultimately, the difference
between a lake and a pond is in the eye of the original namer. "It's a very subjective and emotional process," says executive secretary Roger Payne, who is quick to add that there are 95 federally recognized Big Ponds and 1,366 Little Lakes in this country. "We're not here to question people's logic."
|This month, all of the planetary drama will occur 40 minutes before sunrise in the early morning sky, with Venus and Jupiter particularly brilliant in the east. Jupiter spends much of the month on an upward, east-southeasterly course, starting just eight degrees to the upper-right of Venus on the first
and ending the month 37 degrees distant. Throughout the first half of May, Mercury will be low over the east-northeast horizon, visible with binoculars as a pale yellow dot in the dawn sky. The full Moon occurs on the 11th, and Saturn re-emerges as a morning planet one day later, just over the eastern horizon. May is also a good time for viewing the
constellation Virgo, easily identified at 45 degrees in the southern night sky by the white-blue star Spica.
— Jean Quashnock
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