Agriculture
Middle school science adventures
Microbes at the Gas Pump
Seeds of the Future
Amphibians
Tree Frogs
Toads
Bullfrogs
Animals
Crocodile Hearts
Putting a Mouse on Pause
Glimpses of a Legendary Woodpecker
Behavior
Ear pain, weight gain
Lost Sight, Found Sound
Storing Memories before Bedtime
Birds
Kingfishers
Birds We Eat
Penguins
Chemistry and Materials
Diamond Glow
Sticky Silky Feet
Salt secrets
Computers
A New Look at Saturn's rings
Two monkeys see a more colorful world
A Light Delay
Dinosaurs and Fossils
A Living Fossil
Fingerprinting Fossils
Did Dinosaurs Do Handstands?
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Easy Ways to Conserve Water
Science loses out when ice caps melt
Petrified Lightning
Environment
Fishing for Fun Takes Toll
Plastic Meals for Seals
To Catch a Dragonfly
Finding the Past
Salt and Early Civilization
Stone Tablet May Solve Maya Mystery
Your inner Neandertal
Fish
Barracudas
Tilapia
Goldfish
Food and Nutrition
Recipe for Health
A Taste for Cheese
Packing Fat
GSAT English Rules
Who vs. That vs. Which
Whoever vs. Whomever
Adjectives and Adverbs
GSAT Exam Preparation Jamaica
GSAT Practice Papers | GSAT Mathematics | Maths
Ministry of Education Announces 82 GSAT Scholarships for 2010
Mastering The GSAT Exam
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
42,000 students will sit for the GSAT Exam in two weeks
GSAT Scholarship
GSAT Mathematics
Math Naturals
10 Common Mistakes When Preparing for the GSAT Math Test
Secrets of an Ancient Computer
Human Body
The tell-tale bacteria
Sun Screen
Foul Play?
Invertebrates
Black Widow spiders
Praying Mantis
Leeches
Mammals
Pitbulls
Golden Retrievers
Mouse
Parents
Choosing a Preschool: What to Consider
Expert report highlights the importance to parents of reading to children!
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
The Pressure of Scuba Diving
Echoes of a Stretched Egg
The Mirror Universe of Antimatter
Plants
The algae invasion
Fungus Hunt
Sweet, Sticky Science
Reptiles
Turtles
Anacondas
Snakes
Space and Astronomy
A Dead Star's Dusty Ring
Baby Star
Rover Makes Splash on Mars
Technology and Engineering
Machine Copy
A Clean Getaway
Crime Lab
The Parts of Speech
Pronouns
What is a Verb?
Problems with Prepositions
Transportation
Charged cars that would charge
Revving Up Green Machines
Are Propellers Fin-ished?
Weather
The solar system's biggest junkyard
A Change in Climate
Warmest Year on Record
Add your Article

A Human Migration Fueled by Dung?

If you think traveling to Alaska in the winter sounds cold today, imagine what it was like thousands of years ago.

Before the invention of central heating and hot cocoa, it would have been too cold for people to migrate to North America through the frigid tundra—without trees or firewood. Or so scientists thought.

Now, researchers suggest that our ancestors could have survived cold-weather travel if they had taken advantage of all the dung lying around.

More than 50,000 years ago, Alaska was connected to northern Russia by a land bridge that is now largely underwater. Yet people didn’t make the crossing until about 14,000 years ago, according to archaeological and genetic evidence. Scientists have long blamed the delay on cold weather and a lack of fuel for heating and cooking.

That might not be the best explanation, says David Rhode of the Desert Research Institute in Reno, Nev., who has studied the dung-burning habits of modern Tibetans. To heat their tents and cook their food, Rhode has observed, a single family living on the Tibetan Plateau burns between 25 and 40 kilograms of dried yak dung in the summer and twice that in the winter. That’s a lot of dung. But the Tibetans are pretty efficient dung-gatherers.

A wintry landscape in the region once linked by the Bering Land Bridge.

A wintry landscape in the region once linked by the Bering Land Bridge.

National Park Service

Thousands of years ago, Rhode says, the route from Russia to Alaska would have been bursting with big plant-eating animals, like bison, mammoths, horses, and wooly rhinoceroses. With animals comes waste. There should have been plenty of dried dung to fuel the trip.

So, why the delay? Maybe our ancestors took a while to realize the value of the poop along their path!—E. Sohn

 

A Human Migration Fueled by Dung?
A Human Migration Fueled by Dung?








Designed and Powered by HBJamaica.com™