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Ice and sky

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11 Meaningful Earth Day Activities for Every Grade Level Our students are the future caretakers of our Earth. These fun Earth Day activities help empower kids to have a positive impact on the planet. From recycled art projects to farming simulations, here’s how to roll out the green carpet in your classroom on Earth Day this year. 1. Engineering for Good (Grades 6–8) Your middle schoolers know that drinking plenty of H2O is good for them, but they may not realize the impact all those plastic water bottles have on the environment.

What the World Would Look Like if All the Ice Melted This story appears in the September 2013 issue of National Geographic magazine. The maps here show the world as it is now, with only one difference: All the ice on land has melted and drained into the sea, raising it 216 feet and creating new shorelines for our continents and inland seas. There are more than five million cubic miles of ice on Earth, and some scientists say it would take more than 5,000 years to melt it all. If we continue adding carbon to the atmosphere, we’ll very likely create an ice-free planet, with an average temperature of perhaps 80 degrees Fahrenheit instead of the current 58. North America

Asteroid-bound spacecraft gets its first scientific instrument NASA has begun attaching scientific instruments to the OSIRIS-REx probe, just over a year before it starts making its way to asteroid Bennu. The first instrument to arrive at Lockheed Martin's HQ is Arizona State University's microwave-sized device called OSIRIS-REx Thermal Emission Spectrometer or OTES. It's designed switch on shortly after the spacecraft begins its two-year journey to Bennu, and to take the near-Earth asteroid's temperature every two seconds once it arrives. The instrument, which has undergone development and testing these past few years, will also scan the celestial body's surface to map minerals and chemicals. Timelapse: Landsat Satellite Images of Climate Change, via Google Earth Engine TIME and Space | By Jeffrey Kluger Spacecraft and telescopes are not built by people interested in what’s going on at home. Rockets fly in one direction: up. Telescopes point in one direction: out. Of all the cosmic bodies studied in the long history of astronomy and space travel, the one that got the least attention was the one that ought to matter most to us—Earth.

Abrupt glacier melt causes Canadian river to vanish in four days Updated A vast glacier-fed river which flowed from Canada's Yukon territory across Alaska to drain into the Bering Sea has disappeared in just four days, in what scientists believe is the first observed case of "river piracy". High average temperatures in the first three months of 2016 caused a dramatic spike in the amount of meltwater flowing from the Kaskawulsh glacier, carving a deep canyon in the ice and redirecting the flow toward the Alsek River in the south, rather than the north-flowing Slims River. That changed the Slims River from a three-metre-deep, raging torrent to a place where "massive afternoon dust storms occurred almost daily", according to a scientific paper published in the journal Nature Geoscience. "We were really surprised when we got there and there was basically no water in the river," lead author Daniel Shugar said of the Slims River. "We could walk across it and we wouldn't get our shirts wet."

Two Superpowers We Wish We Had At some point today, you’ll probably do one or all of these things: Flip a switch for light. Take fresh food from a refrigerator. Turn a dial to make your home warmer or cooler. Press a button on your laptop to go online.

Movie: Harvard's Organs-on-Chips can replace animal testing Microdevices that mimic human organs could replace animal testing Dezeen and MINI Frontiers: Harvard University's Human Organs-on-Chips was crowned Design of the Year 2015 this week. Scientist Tony Bahinski explains how the chips could one day replace animal testing (+ movie). "The problem with animal testing models is the ethics involved," Bahinski says in the movie. "But they are also not very predictive of the human response. Why Time Flies Have you ever noticed how older people keep mentioning that time keeps moving faster and faster? It's because we perceive time relative to the 'absolute' time we can compare it to... When you are 4 weeks old, a week is a quarter of your life. What Is a Wind Farm? What do you think of when you hear the word “farm”? Animals? Vegetables? Tractors? Farmers?

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