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With eight strong arms and a bulging head, an octopus is one of the wildest-looking animals in the ocean. Dive in and test your cephalopod smarts with this photo matching game.
From weather reports to cell phones, satellites play a big part in your life. Picture-snapping satellites also can give us a whole new view of Earth. Check out some amazing images taken from these eyes in the sky.
Travel high into the Andes Mountains in Peru to discover Machu Picchu. Why did the Inca build it, and then abandon this city above the clouds?
Photographs: © Reinhard Bruckner/Age Fotostock (octopus); © Izmael/Shutterstock (Great Wall of China); USGS/NASA (satellite image); © Visuals Unlimited/Corbis (salamander)