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Where Have All the Bees Gone?
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2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
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Wave of Destruction
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Of Lice and Old Clothes
Fish
Whale Sharks
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A Taste for Cheese
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Results of GSAT are in schools this week
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2014 GSAT Results for Jamaican Kids
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GSAT Mathematics
Math of the World
How to Slice a Cake Fairly
42,000 students will sit for the GSAT Exam in two weeks
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Don't Eat That Sandwich!
Kids now getting 'adult' disease
Prime Time for Broken Bones
Invertebrates
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African Zebra
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The Surprising Meaning and Benefits of Nursery Rhymes
Choosing a Preschool: What to Consider
Expert report highlights the importance to parents of reading to children!
Physics
Strange Universe: The Stuff of Darkness
Dreams of Floating in Space
Gaining a Swift Lift
Plants
Surprise Visitor
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Sweet, Sticky Science
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Black Mamba
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Space and Astronomy
Sun Flips Out to Flip-Flop
Return to Space
Slip-sliding away
Technology and Engineering
Roll-Up Computer Monitors to Go
A Clean Getaway
Drawing Energy out of Wastewater
The Parts of Speech
Pronouns
What is a Noun
Adjectives and Adverbs
Transportation
Seen on the Science Fair Scene
Middle school science adventures
Robots on a Rocky Road
Weather
Watering the Air
Recipe for a Hurricane
Arctic Melt
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Weekend Weather Really Is Different

Do you ever feel like the weather is out to get you? All week long, it seems, you sit inside at school while the sun shines outside. Then, as soon as the weekend comes, the sky turns gray. There's rain in the forecast. In some ways, you may be right. Weekend weather differs from weekday weather in certain places, say researchers who studied more than 40 years of weather data from around the world. They focused on temperature differences between daytime highs and nighttime lows. This difference measurement is called the diurnal temperature range, or DTR. Part of the study involved 660 weather stations in the continental United States. At more than 230 of these sites, the average DTR for Saturday, Sunday, and Monday was different from the average DTR for Wednesday, Thursday, and Friday, the researchers found. The difference was small—only several tenths of a Celsius degree—but the pattern was striking enough to make the scientists take notice. In the southwestern U.S., temperature ranges were typically broader on weekends. In the Midwest, weekdays saw larger daily temperature variations. This sort of weekly rise and fall doesn't line up with any natural cycles, the researchers say. Instead, they blame human activities, possibly air pollution from those activities, for these weather effects. For example, tiny particles in the air could affect the amount of cloud cover, which would in turn affect daily temperatures. So, tiny windborne particles from California, generated on weekdays, might first affect weather close to home in the southwest, then later influence midwestern weather. It looks like your weekend weather has a lot do with which way the wind blows and where it comes from.—E. Sohn

Weekend Weather Really Is Different
Weekend Weather Really Is Different








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