Tesla’s Cheapest Model X Is Priced At $80,000

How NASA is protecting other planets from a very real threat: us

It's natural to worry about contamination from aliens, but who worries about sheltering them from us?

When Catharine Conley started her job at NASA, her predecessor gave her a pair of dark Ray Ban sunglasses. It’s only fitting — Conley is a real-life version of the famously shaded title characters in the 1997 movie Men in Black. Part of her job as planetary protection officer is to keep Earth safe from alien life. But, as far as we know, Earthlings are the ones regularly hopping around the solar system, so most of her job is to protect aliens from the human race.

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Why wildfires are necessary

Did you know that several forest species need fire to survive?

In the conifer-rich forests of western North America, lodgepole pines constantly seek the sun. Their seeds prefer to grow on open, sunny ground, which pits saplings against each other as each tries to get more light by growing straighter and faster than its neighbors. Over time, generations of slender, lofty lodgepoles form an umbrella-like canopy that shades the forest floor below. But as the trees’ pine cones mature to release their twirling seeds, this signals a problem for the lodgepole’s future: very few of these seeds will germinate in the cool, sunless shade created by their towering parents.

These trees have adapted to this problem by growing two types of cones. There are the regular annual cones that release seeds spontaneously:

And another type called serotinous cones, which need an environmental trigger to free their seeds:

Serotinous cones are produced in thousands and are like waterproof time capsules sealed with resinous pitch. Many are able to stay undamaged on the tree for decades. Cones that fall to the ground can be viable for several years as well. But when temperatures get high enough, the cones pop open.

Once it’s gotten started, a coniferous forest fire typically spreads something like this: flames ravage the thick understory provided by species like Douglas Fir, a shade-tolerant tree that’s able to thrive under the canopy of lodgepole pines. The fire uses these smaller trees as a stepladder to reach the higher canopy of old lodgepole pines. That ignites a tremendous crown fire, reaching temperatures of up to 2400 degrees Fahrenheit. At those temperatures, the serotinous cones burst open, releasing millions of seeds which are carried by the hot air to form new forests. After the fire, carbon rich soils and an open, sunlit landscape help lodgepole seeds germinate quickly and sprout in abundance. From the death of the old forest comes the birth of the new.

So however counterintuitive it may seem, wildfires are important for the wider ecosystem as a whole. Without wildfires to rejuvenate trees, key forest species would disappear—and so would the many creatures that depend on them. And if a fire-dependent forest goes too long without burning, that raises the risk of a catastrophic blaze which could destroy a forest completely, not to mention people’s homes and lives. That’s why forest rangers sometimes intentionally start controlled burns—to reduce fuels in order to keep the more dangerous wildfires at bay.  

From the TED-Ed Lesson Why wildfires are necessary - Jim Schulz

Animation by @provinciastudio

Watch This New Drone Capture Rogue Drones with a Net Cannon

Scientists at Michigan Tech University have made an interceptor drone that is capable of “catching” other drones using a mounted net cannon.See it in action: http://futurism.com/videos/new-drone-can-capture-rogue-drones-net-cannon/

Studies show that people decide if you’re trustworthy, adventurous, successful, smart, extroverted, or likeable within 3 seconds of meeting you. Source

Sky-piercing towers, Hyperloop transports, driverless cars, and 3D-printed buildings. Welcome to Dubai, the City of the Future.

4 Fun Facts Animated by Teachers

Last week, the TED-Ed Animation Team facilitated animation workshops with TED-Ed Innovative Educators. We introduced them to basic stop-motion tricks and techniques in hopes that they would begin to incorporate animation into their classroom projects - and based on the results, we think they are up to the challenge!

Earlier this fall, we sourced some fun facts from the educators themselves, and then tasked them with visualizing that very information. We used tablets with #istopmotion to shoot the animation, and basic household objects and school supplies as props and materials. We dare say that you, too, can do this from home!

1. When an object’s mass doubles, its kinetic energy also doubles, but when an object’s SPEED doubles, its kinetic energy quadruples.

2. If a male sperm was the size of a human being, it would swim the 100 metre freestyle in half of the world record time.

3. Approximately one word is added to the English language every two hours.

4. If you condensed the Earth’s history into 24 hours, humans wouldn’t exist until 11:58pm.

A man in Sweden accidentally captured this image of a green meteorite while taking pictures of the Northern lights.

Inhabitat’s Week in Green: Paris climate talks, and more!

(via Biological & Popular Culture // Dino Pet)

Bio-luminescent dinoflagellates…