The snowman orbiting the sun

It is in humanity's nature to explore. From the first hesitant steps out of Africa, to the intrepid sailing ships venturing away from Europe in the 1400s, we've always looked to the horizon, yearning for land or adventure. That desire to venture into the unknown continues powerfully today, as we can see from China's announcement that it has landed a rover on the far side of the moon and also from the remarkable news from NASA's New Horizons probe.

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