TIM: I guess they could be your friends, but usually robots don't have much of a personality. TIM: Simply put, a robot is a mechanical device controlled by a computer. Images show a round, robotic vacuum cleaner, a welding robot, and a human-shaped robot. Most robots today may not be as exciting as the walking, talking, mechanical people you see in science fiction, but they're still pretty cool. And by today's standards of robotics, you're pretty, sophisticated. TIM: Dear Tim and Moby, What are robots? From, Jac Moby holds two toy robots in his hands, then bumps their heads together. Tim smiles awkwardly.Text reads: The Mysteries of Life with Tim and Moby TIM: Speaking of which, we better migrate back home.
It's thought that our species originated in Africa, then migrated over thousands of years to populate the rest of the planet.Īn animated world map represents human origins in Africa and, using arrows, illustrates human migration to Europe, Asia, and elsewhere. By the way, humans have a history of migration, too. But the amount of sunlight, the temperature, and their own internal chemistry can give animals a good idea of when to start moving. Moby pictures a bird's nest containing a mother bird and an alarm clock. They have internal clocks that let them know what time of year it is. TIM: And animals are amazingly sensitive to changes in season. Magnetic lines radiate from Earth in a similar way as they do from the bird's head. TIM: It's thought that these particles allow the birds to use Earth's magnetic field to find their way.Ī second animation shows the earth from space. Radiating lines represent a magnetic field centered on the bird's head. Certain migratory birds have tiny particles of the magnetic mineral magnetite in their brains.Īn animation shows a flying bird. Images represent the wind, a water current, and a mountain.
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TIM: Animals use all kinds of guides to know how to get where they're going, wind patterns, currents in the water, and even geographic landmarks.
They move from place to place until the food supply runs out, rarely hitting the same place twice.Īn animation shows a swarm of locusts flying over a town. TIM: And some animals, like locusts, follow one-way, or removal, migrations. Elephants in Mali, Africa can hear rainstorms from very far away and travel quickly to meet them.Īn animation shows a herd of elephants hearing a rainstorm and acting as Tim describes. Some animals migrate on a nomadic, or unpredictable, schedule. Migrations aren't always controlled by the seasons, though. TIM: Yeah, you could say that migration is a way for animals to keep their environments stable and friendly. TIM: And make it tougher for newborn animals to survive.Īn animation shows a bird in a nest during a blizzard. Shifts in weather can affect food supplies.Īn image shows a reindeer on a tundra. Seasonal changes can have huge effects on animals. TIM: Yeah, and they do it every year of their lives.
TIM: Some birds fly thousands of kilometers on their migrations, nonstop. The journeys animals take can be extremely long.Īn animation shows a map of North America, a hummingbird flying north and south, and changing calendar pages denoting the passing of time. TIM: Most migrations are seasonal, meaning they happen every year at certain times. Images show a plant, the sun, and an egg. Animals usually migrate for any of three reasons, to find more food, to reach a better climate, or to ensure reproduction. TIM: Migration is the instinctive movement of a group of animals. TIM: Dear Tim and Moby, why do animals migrate? From, Hubert. Text reads: The Mysteries of Life with Tim and MobyĪ boy, Tim, and a robot, Moby, are walking through an autumn forest.
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