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Gaze north from America across the Great White North and Canada appears a boundless land brimming with rugged wilderness, sawtooth mountains and remote tundra plains. But in fact just 10% of Canada's nearly 40 million populace resides in those iconic frigid hinterlands. A full 90% instead clusters within a narrow strip along the southern border - often not far north of U.S. territory at all.

At first glance, lemons and limes appear quite similar - two bright green citrus fruits packing a tart, zesty bite. Their flavors infuse countless refreshing foods and drinks from sorbets to cocktails. Yet subtle differences set them deliciously apart beyond simply swirling yellow and green.

Like a lot of masterpieces from centuries past, “In Milan’s unassuming Santa Maria delle Grazie monastery, millions flock to glimpse Leonardo da Vinci’s spellbinding mural The Last Supper - Jesus’ final gathering alive with drama moments before betrayal. Though now an iconic masterpiece of the High Renaissance, it may shock tourists to learn the painting once moldered decrepit and vandalized for centuries, its innovations lost on contemporaries.The Last Supper” has undergone significant changes since it first saw the light of day. Perhaps most significantly, Leonardo da Vinci’s...

In a future not so far off, your smartphone, computer, or front door may feature advanced biometric security to confirm your identity before granting access. But rather than pressing a finger or peering into a retinal scanner, authenticating yourself could one day be as easy as sticking out your tongue!

Out on the rugged rangelands, a herd of vigilant goats monitors the scrubby hills for any lurking threats. Suddenly, a mountain lion explodes from cover. But using their unique rectangular pupils, the goats detected the hunter before its lethal rush. Now the herd scrambles away using vision uniquely adapted to escape predators and navigate rocky slopes at speed.

In a Delaware laboratory one fateful afternoon in 1965, a young chemist noticed something peculiar. A batch of polymers emerged from solution runny instead of syrupy, unlike the typical experimental output. Though colleagues advised discarding the apparent failure, Stephanie Kwolek instead saw promise in this cloudy concoction’s curious qualities.