Billy A

Along America's northern frontier sprawls an aquatic kingdom spanning 94,600 square miles - the largest surface freshwater system on Earth. Encompassing Lakes Superior, Huron, Michigan, Erie and Ontario, this watery realm contains over 117 trillion gallons supplying 40 million people while supporting economies from Canada to Minnesota to New York.

That morning cup of coffee jumpstarting your workday also traces back to compounds plants employ in their own daily battles - as stealth pesticides. The caffeine enriching popular beverages actually helps vegetation fend off hungry insects and destructive infestations.

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!