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Got Milk? How?
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Hot Pepper, Hot Spider
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Atom Hauler
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Troubles with Hubble
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The bug that may have killed a dinosaur
A Really Big (but Extinct) Rodent
A Big, Weird Dino
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Watering the Air
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Stonehenge Settlement
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Detecting True Art
Human Body
Spitting Up Blobs to Get Around
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Giant Clam
Cockroaches
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Rodents
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Gazelle
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Choosing a Preschool: What to Consider
Children and Media
Expert report highlights the importance to parents of reading to children!
Physics
Invisibility Ring
Strange Universe: The Stuff of Darkness
Echoes of a Stretched Egg
Plants
A Change in Leaf Color
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Farms sprout in cities
Reptiles
Sea Turtles
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Reptiles
Space and Astronomy
Slip-sliding away
A Family in Space
Phantom Energy and the Big Rip
Technology and Engineering
Slip Sliming Away
A Satellite of Your Own
Bionic Bacteria
The Parts of Speech
Problems with Prepositions
What is a Noun
What is a Verb?
Transportation
Morphing a Wing to Save Fuel
Robots on the Road, Again
Charged cars that would charge
Weather
The solar system's biggest junkyard
Arctic Melt
Recipe for a Hurricane
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Crabs

The term crab is often applied to several different groups of short (nose to tail) crustaceans with thick exoskeletons, but only members of the Brachyura are true crabs. Others, such as hermit crabs, porcelain crabs and king crabs are, despite superficial similarities, not crabs at all; they can be distinguished from true crabs by counting the legs (Uninjured true crabs always have five visible pairs of legs.) True crabs have five pairs of walking legs (the first of which is modified into a pair of claws) and typically a flattened shell. In all but a few crabs, the abdomen is folded under the cephalothorax. The form of the abdomen usually reveals the sex of the crab; males have a narrow abdomen, while females have a much wider abdomen, under which they carry their eggs. Crabs are a very diverse group, mostly found in saltwater, but with some groups living in freshwater or on land. Although famed for their tendency to walk sideways, crabs are in fact able to walk in any direction. Twenty percent: Crabs make up 20% of all marine crustaceans caught and farmed worldwide, with over 1˝ million tonnes being consumed annually. Of that total, one species accounts for one fifth: Portunus trituberculatus. Other important taxa include Portunus pelagicus, several species in the genus Chionoecetes, Callinectes sapidus, Charybdis spp., Cancer pagurus, Cancer magister and Scylla serrata, each of which provides more than 20,000 tonnes annually.

Crabs
Crabs








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