Plants were here before us and they'll likely be here when we're gone as well. When the only job you have is to survive (much like a plant), you'd better be pretty darn good at it. Over thousands of years, modern plants have evolved to be stronger and better at surviving than you realize. You'll never believe what kind of surroundings they're able to thrive in. Seeing them grow in places where that would seem impossible is actually kind of inspiring. Take a look and you'll see why! Over time, even the pavement couldn't stop this little sprout. Dr. Sara...