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Protecting Cows—and People—from a Deadly Disease
Fast-flying fungal spores
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Ant Invasions Change the Rules
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Tool Use Comes Naturally to Crows
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A brain-boosting video game
Two monkeys see a more colorful world
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Spinning Clay into Cotton
Pencil Thin
The Taste of Bubbles
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It's a Small E-mail World After All
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2014 GSAT Results for Jamaican Kids
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Getting the dirt on carbon
Farms sprout in cities
Detecting an Eerie Sea Glow
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A Stormy History
The Best Defense Is a Good Snow Fence
Improving the Camel
Finding the Past
Chicken of the Sea
Ancient Art on the Rocks
A Long Trek to Asia
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Sponges' secret weapon
Symbols from the Stone Age
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Who vs. Whom
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Order of Adjectives
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Tarrant High overcoming the odds
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Math is a real brain bender
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10 Common Mistakes When Preparing for the GSAT Math Test
Human Body
Workouts: Does Stretching Help?
Foul Play?
Disease Detectives
Invertebrates
Sea Anemones
Giant Squid
Sponges
Mammals
Ferrets
Miniature Schnauzers
Cougars
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The Surprising Meaning and Benefits of Nursery Rhymes
What Not to Say to Emerging Readers
How children learn
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Powering Ball Lightning
Gaining a Swift Lift
The Pressure of Scuba Diving
Plants
City Trees Beat Country Trees
Seeds of the Future
When Fungi and Algae Marry
Reptiles
Chameleons
Iguanas
Copperhead Snakes
Space and Astronomy
Supernovas Shed Light on Dark Energy
Holes in Martian moon mystery
Unveiling Titan
Technology and Engineering
A Satellite of Your Own
A Light Delay
Smart Windows
The Parts of Speech
Countable and Uncountable Nouns
What is a Preposition?
What is a Noun
Transportation
Robots on the Road, Again
Tinkering With the Basic Bike
Reach for the Sky
Weather
In Antarctica watch the heat (and your step)
Arctic Melt
Either Martians or Mars has gas
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Fleas

Flea is the common name for any of the small wingless insects of the order Siphonaptera. Fleas are external parasites, living off the blood of mammals and birds. Itch causing critters: In most cases, fleas are just a nuisance to their hosts, but some people and some animals suffer allergic reactions to flea saliva resulting in rashes. Flea bites generally result in the formation of a slightly raised, swollen, itching spot with a single puncture point at the center. Fleas can also lead to hair loss as a result of frequent scratching and biting by the animal, and can cause anemia in extreme cases. Spreaders... of disease: However, fleas can also act as a vector for disease. One possible example of this was the bubonic plague, which may have been transmitted between rodents and humans. Murine typhus (endemic typhus) fever, and in some cases tapeworms can also be transmitted by fleas. Fleas pass through a complete life cycle consisting of egg, larva, pupa and adult. Completion of the life cycle from egg to adult varies from two weeks to eight months depending on the temperature, humidity, food, and species. Normally after a blood meal, the female flea lays about 15 to 20 eggs per day — up to 600 in its lifetime — usually on the host (dogs, cats, rats, rabbits, mice, squirrels, chipmunks, raccoons, opossums, foxes, chickens, humans, etc.). Eggs loosely laid in the hair coat drop out almost anywhere, especially where the host rests, sleeps or nests (rugs, carpets, upholstered furniture, cat or dog boxes, kennels, sand boxes, etc.). Eggs hatch between two days to two weeks into larvae found indoors in and along floor cracks, crevices, along baseboards, under rug edges and in furniture or beds. Outdoor development occurs in sandy gravel soils (moist sand boxes, dirt crawlspace under the house, under shrubs, etc.) where the host may rest or sleep. Sand and gravel are very suitable for larval development which is the reason fleas are erroneously called "sand fleas." Larvae are blind, avoid light, pass through three larval instars and take a week to several months to develop. Their food consists of digested blood from adult flea feces, dead skin, hair, feathers, and other organic debris; larvae do not suck blood. Pupae mature to adulthood within a silken cocoon woven by the larva to which pet hair, carpet fiber, dust, grass cuttings, and other debris adheres. In about five to fourteen days, adult fleas emerge or may remain resting in the cocoon until the detection of vibration (pet and people movement), pressure (host animal lying down on them), heat, noise, or carbon dioxide (meaning a potential blood source is near). Most fleas overwinter in the larval or pupal stage with survival and growth best during warm, moist winters and spring. "Flea season" is traditionally at the end of summer and in the early fall, but in warmer areas can last year round.

Fleas
Fleas








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