Agriculture
Hungry bug seeks hot meal
Microbes at the Gas Pump
Watching out for vultures
Amphibians
Toads
Salamanders and Newts
Salamanders
Animals
Return of the Lost Limbs
Monkeys Count
Helping the Cause of Macaws
Behavior
Listen and Learn
Nice Chimps
The Disappearing Newspaper
Birds
Emus
Carnivorous Birds
Vultures
Chemistry and Materials
The Buzz about Caffeine
Sticking Around with Gecko Tape
Cooking Up Superhard Diamonds
Computers
It's a Small E-mail World After All
Toxic Dirt + Avian Flu = Science Fair Success
The Shape of the Internet
Dinosaurs and Fossils
Mammals in the Shadow of Dinosaurs
The man who rocked biology to its core
Did Dinosaurs Do Handstands?
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Earth
The Pacific Ocean's Bald Spot
Coral Islands Survive a Tsunami
Arctic Algae Show Climate Change
Environment
A Newspaper's Hidden Cost
A Stormy History
Watching for Wildfires in Yellowstone
Finding the Past
The Puzzle of Ancient Mariners
Untangling Human Origins
Sahara Cemetery
Fish
Mahi-Mahi
Hammerhead Sharks
Bull Sharks
Food and Nutrition
Healing Honey
The Color of Health
Yummy bugs
GSAT English Rules
Whoever vs. Whomever
Problems with Prepositions
Who vs. Whom
GSAT Exam Preparation Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
42,000 students will sit for the GSAT Exam in two weeks
2014 GSAT Results for Jamaican Kids
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Scholarship
GSAT Mathematics
Math and our number sense: PassGSAT.com
Math Naturals
A Sweet Advance in Candy Packing
Human Body
Heart Revival
A Better Flu Shot
Running with Sneaker Science
Invertebrates
Bees
Jellyfish
Millipedes
Mammals
Elk
Wolves
Minks
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
Raise a Lifelong Reader by Reading Aloud
Children and Media
Physics
Echoes of a Stretched Egg
Invisibility Ring
Speedy stars
Plants
Bright Blooms That Glow
Plants Travel Wind Highways
Stalking Plants by Scent
Reptiles
Turtles
Gila Monsters
Box Turtles
Space and Astronomy
Burst Busters
Mercury's magnetic twisters
A Whole Lot of Nothing
Technology and Engineering
Are Propellers Fin-ished?
Dancing with Robots
Supersuits for Superheroes
The Parts of Speech
Countable and Uncountable Nouns
What is a Preposition?
Problems with Prepositions
Transportation
Where rivers run uphill
Seen on the Science Fair Scene
Morphing a Wing to Save Fuel
Weather
In Antarctica watch the heat (and your step)
Catching Some Rays
The solar system's biggest junkyard
Add your Article

Clone Wars

Sea anemones look like peaceful creatures. The squishy animals cling to rocks and wave their tentacles around. They grab whatever food comes along as the watery world passes by. Anemones, however, aren't as mellow as they might seem. Researchers have observed armies of anemones attacking each other in raging wars. "Sea anemone fights are amazing," says David Ayre of the University of Wollongong in Australia. Some 50 years ago, scientists noticed that certain anemones have special tentacles that aren't used for capturing food. Called acrorhagi, these tentacles are used instead as weapons to sting enemy anemones. Certain individuals, called warriors, have lots of acrorhagi. Some kinds of sea anemones live pretty much by themselves but a common kind, Anthopleura elegantissima, on the west coast of the United States sticks together in dense groups. Each member of a group has exactly the same DNA as every other member of the group, making them genetic clones of each other. Researchers wanted to learn more about how anemones fight, but A. elegantissima are hard to study in the wild. So, the scientists toiled to move a big boulder with two groups of anemone clones into their lab. They had an aquarium built around it. The aquarium was regularly filled with water, and then emptied again to copy the action of tides. When water rushed in after low tide in the aquarium, the researchers were surprised to find, warrior anemones near the border between the groups puffed up their acrorhagi, made their bodies three times longer than they were before, and started twisting around. They were able to reach out and sting foreign individuals that had crept too close. The surprises didn't stop there. Anemone patches grow close to each other but usually leave an empty strip between them. Small anemones in the first row sometimes creep into this strip, ending up very close to the other patch. One little critter that had crept into the empty zone, nicknamed Stumpy, endured such a strong attack that its own colony rejected it when it returned home. The researchers suggest that the attack covered Stumpy with so many foreign stinging cells that its own clones didn't recognize it. Perhaps, they say, small anemones like Stumpy work as scouts in battle. It's a tough world out there—even for creatures that look as if they have a mellow lifestyle.—E. Sohn

Clone Wars
Clone Wars








Designed and Powered by HBJamaica.com™