Agriculture
Flush-Free Fertilizer
Growing Healthier Tomato Plants
Getting the dirt on carbon
Amphibians
Toads
Newts
Tree Frogs
Animals
Sea Giants and Island Pygmies
Stunts for High-Diving Ants
Monkey Math
Behavior
Dino-bite!
Meet your mysterious relative
Sugar-pill medicine
Birds
Pelicans
Condors
Blue Jays
Chemistry and Materials
A New Basketball Gets Slick
Fog Buster
Gooey Secrets of Mussel Power
Computers
Batteries built by Viruses
Play for Science
Earth from the inside out
Dinosaurs and Fossils
Have shell, will travel
Big Fish in Ancient Waters
An Ancient Spider's Web
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
Getting the dirt on carbon
Weird, new ant
Easy Ways to Conserve Water
Environment
Giant snakes invading North America
Toxic Cleanups Get a Microbe Boost
A 'Book' on Every Living Thing
Finding the Past
Chicken of the Sea
Preserving Ancient Warrior Paint
Settling the Americas
Fish
Angler Fish
Perches
Electric Catfish
Food and Nutrition
Yummy bugs
Recipe for Health
A Pepper Part that Burns Fat
GSAT English Rules
Order of Adjectives
Whoever vs. Whomever
Adjectives and Adverbs
GSAT Exam Preparation Jamaica
GSAT Practice Papers | GSAT Mathematics | Maths
Preparing for the GSAT Exam
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
GSAT Exams Jamaica Scholarships
GSAT stars reap scholarship glory
2014 GSAT Results for Jamaican Kids
GSAT Scholarship
GSAT Mathematics
Math and our number sense: PassGSAT.com
Losing with Heads or Tails
Math Naturals
Human Body
Heavy Sleep
Kids now getting 'adult' disease
Don't Eat That Sandwich!
Invertebrates
Dust Mites
Flatworms
Praying Mantis
Mammals
Killer Whales
Goats
Mongooses
Parents
What Not to Say to Emerging Readers
Choosing a Preschool: What to Consider
Raise a Lifelong Reader by Reading Aloud
Physics
Road Bumps
Thinner Air, Less Splatter
Electric Backpack
Plants
Nature's Alphabet
Pumping Up Poison Ivy
Bright Blooms That Glow
Reptiles
Snakes
Gila Monsters
Rattlesnakes
Space and Astronomy
Galaxies Divide Sharply Along Color Lines
A Great Ball of Fire
Asteroid Moons
Technology and Engineering
Are Propellers Fin-ished?
Shape Shifting
Slip Sliming Away
The Parts of Speech
Countable and Uncountable Nouns
Adjectives and Adverbs
What is a Noun
Transportation
Troubles with Hubble
Reach for the Sky
Robots on a Rocky Road
Weather
Science loses out when ice caps melt
A Dire Shortage of Water
Watering the Air
Add your Article

Secrets of an Ancient Computer

Computers go back farther in history than you might imagine. A mysterious mechanism found in a 2,000-year-old Greek shipwreck may have been used to calculate the positions of planets, predict when eclipses were to occur, and do other astronomical chores. Known as the Antikythera (pronounced an-tee-KITH-air-uh) mechanism, the device is about the size of a shoebox. When it was found underwater about 100 years ago, the mechanism was in poor shape. Its metal pieces had congealed into one mass, then broken into pieces. People who studied what was left of the mechanism suspected that it had something to do with astronomy. To find out more, researchers recently used advanced imaging methods, including X-ray computer tomography, to look inside the metal fragments and to check for ancient writing on the device. "The computer tomography images of the mechanism have literally opened the device up to us to see how it worked," says John M. Steele, who studies ancient astronomy at the University of Durham in England. The researchers discovered that the mechanism had at least 30 bronze gears with as many as 225 teeth, likely all cut by hand. This fresh look provided clear evidence that the device could have been used to compute eclipses of the sun and moon. A lunar eclipse occurs when the moon passes into Earth's shadow, and a solar eclipse occurs when the moon passes between the sun and Earth. Scientists suspect that the mechanism was also able to show the motions of the planets. A user could pick a day in the future and, using some sort of crank, work out a planet's position on that date. The new images doubled the number of engravings that the scientists could read. These inscriptions revealed uses for the machine that were previously unknown. With the added information, the researchers came up with a new model for how the mechanism operated. The model takes into account 29 of the 30 known gears and adds five more that were probably there but never found. The new picture adds a previously undiscovered spiral dial to the back of the device near the bottom. A hand moving around the dial could have pointed to eclipses over a period of 18 years. All these findings show that the Antikythera mechanism was perhaps 1,000 years ahead of anything else discovered from its time period.E. Sohn

Secrets of an Ancient Computer
Secrets of an Ancient Computer








Designed and Powered by HBJamaica.com™