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NASA

Remembering the Challenger Astronauts

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NASA

When the Space Shuttle Challenger disintegrated 73 seconds after liftoff on January 28, 1986, there were seven astronauts on board whose lives were tragically cut short.

1. DICK SCOBEE // COMMANDER

Lt. Col. Francis Richard Scobee enlisted in the U.S. Air Force after graduating from high school in 1957. He served as an engine mechanic and took college classes in his spare time, earning a degree in aerospace engineering from the University of Arizona in 1965, as well as an officer’s commission. He became a pilot the next year and served in Vietnam as a combat aviator. Scobee then became a test pilot and logged 6500 hours flying 45 different types of aircraft. After joining NASA’s astronaut program in 1978, he not only flew the space shuttle, but also instructed pilots on flying the Boeing 747 that carried shuttles to Florida.

Scobee piloted the shuttle Challenger into space on its fifth mission in April 1984; his next assignment was as commander of the Challenger mission in January 1986. Scobee told his family that his second shuttle mission might be his last. An aunt remembered, ''He said he had acquired everything he wanted in life.’’

Scobee achieved the rank of Lieutenant Colonel. He was survived by his wife and two children. His son, Major General Richard W. Scobee, is now the 10th Air Force commander of the Naval Air Station Fort Worth Joint Reserve Base.  

2. MICHAEL J. SMITH // PILOT

Captain Michael John Smith grew up near an airstrip in Morehead, North Carolina, and never wanted to do anything but fly. (Once, when he was the quarterback of a junior varsity football team, he called a timeout just so he could watch a military airplane pass overhead.) He graduated from the U.S. Naval Academy in 1967 and achieved a master’s degree in aeronautical engineering in 1968. Smith became a pilot in 1969 and served as a flight instructor until he was sent to Vietnam. There, Smith earned numerous medals and citations for two years of combat duty. He then became an instructor. Smith logged 4867 hours of flight time in 28 types of aircraft before becoming part of NASA’s astronaut program in 1980. Smith was assigned as pilot for two shuttle missions in 1986, the first scheduled for January aboard the Challenger. Smith was survived by his wife and three children.

3. RONALD MCNAIR // MISSION SPECIALIST

Dr. Ronald Ervin McNair was a high achiever from an early age. He could read before starting school, and in elementary school was inspired by the Soviet Sputnik launch to pursue an education in science. In 1959, when he was 9 years old, McNair challenged the segregated public library in his hometown of Lake City, South Carolina. His brother Carl told the tale to StoryCorps.

McNair’s educational career was littered with honors, and he achieved a Ph.D. in physics from MIT in 1976. His specialties were lasers and molecular spectroscopy, knowledge he put to use at Hughes Research Laboratories. When NASA began accepting scientists and test pilots into its astronaut program in the ‘70s, McNair applied and made the 1978 class of astronaut candidates. He flew on the Challenger in 1984, spending seven days in orbit and becoming the second African American (after Guy Bluford) to fly in space. The Challenger launch in 1986 was to be his second as a mission specialist.

McNair was an accomplished saxophone player and held a 5th degree black belt in karate. He was survived by his wife and two children. In addition to several schools, streets, and parks named in his honor, the old public library building in Lake City became the Ronald E. McNair Life History Center in 2011.  

4. ELLISON ONIZUKA // MISSION SPECIALIST

Colonel Ellison Shoji Onizuka grew up in Kealakekua, Kona, Hawaii. He earned a bachelor’s degree in aerospace engineering in June 1969 from the University of Colorado, and then a master’s degree in December that year. Onizuka immediately joined the Air Force and became an aerospace flight test engineer and then a test pilot. Selected as an astronaut candidate in 1978, Onizuka flew on Discovery—the first Department of Defense shuttle mission—in 1985, becoming the first Asian American astronaut to fly in space. In his career, Onizuka logged 1700 hours of flying time and 74 hours in space. The Challenger mission was to be his second space flight.  

Onizuka, a Lieutenant Colonel in the Air Force, was posthumously promoted to Colonel. He was survived by his wife and two daughters. Among other honors and memorials, the University of Hawaii has held the Astronaut Ellison Onizuka Science Day every year for the past 17 years to promote science education among students in grades four through 12. This year’s Science Day is Saturday, January 28.

5. JUDITH RESNIK // MISSION SPECIALIST

Dr. Judith Arlene Resnika math whiz who also played classical piano, was valedictorian of the Firestone High School Class of 1966 in Akron, Ohio. After earning a perfect SAT score, Resnik went on to get a degree in electrical engineering from Carnegie-Mellon in 1970 and a Ph.D. from the University of Maryland. She helped to develop radar systems for RCA, worked as a biomedical engineer for the National Institutes of Health, and did product development for Xerox, all before being selected for the astronaut program in 1978. She was recruited by Nichelle Nichols of Star Trek fame, who was working for NASA as a recruiter at the time.  

Resnik flew on the space shuttle Discovery in August 1984 and became the second American woman in space (after Sally Ride) as well as the first Jewish American in space. The images from that mission were particularly striking because of Resnik’s long hair floating in microgravity. The Challenger mission was to be her second space flight.  

Among other memorials, the lunar crater Borman X on the far side of the moon was renamed Resnik in 1988. Resnik’s family sued the maker of the defective O-rings that caused the Challenger failure, and used the settlement funds to endow scholarships at Firestone High School and three universities.  

6. GREGORY JARVIS // PAYLOAD SPECIALIST

Gregory Bruce Jarvis was an engineer who became an Air Force captain and an astronaut specifically because of his engineering talent. He earned a bachelor’s degree in electrical engineering in 1967 and a master’s in 1969. Jarvis worked at Raytheon on the SAM-D missile project while completing his studies. He then joined the Air Force and was assigned to research on communications satellites. After an honorable discharge in 1973, Jarvis designed communications satellites for Hughes Aircraft. As an expert in satellite communications, he was selected over 600 other applicants among Hughes employees to be one of two Hughes payload specialists for NASA’s shuttle program in 1984. Jarvis was scheduled for shuttle missions and was bumped twice to make room for celebrity passengers: Utah Senator Jake Garn in March 1985 and Florida Congressman Bill Nelson on January 12, 1986. Jarvis would finally get his chance on the Challenger on January 28.

Jarvis was survived by his wife. In addition to his engineering career, he was an avid outdoorsman and played classical guitar.   

7. CHRISTA MCAULIFFE // PAYLOAD SPECIALIST

In 1984, President Ronald Reagan challenged NASA to make the shuttle’s first “citizen passenger” a teacher. The Teacher in Space Project was born, and more than 11,000 teachers applied for the position. Ultimately, Christa McAuliffe was selected.

Sharon Christa Corrigan McAuliffe held a master’s in education and a job as a social studies teacher at Concord High School in New Hampshire. She had also taught American history, English, and various other subjects at the junior high and high school levels over her 15-year teaching career. McAuliffe arranged for a year away from her job and trained with NASA in anticipation of her shuttle mission. She was supposed to deliver two live lessons broadcast to schools across the country, as well as six more lessons that would be distributed around the country after the shuttle landed.

The fact that a teacher was going to space prompted an unprecedented number of schools to watch the Challenger launch on the morning of January 28, 1986.   

McAuliffe was survived by her husband and two children. The backup teacher selected for the Teacher in Space project, Barbara Morgan, lobbied NASA to reinstate the Teacher in Space program. In 1998, she was named the first Educator Astronaut under a new program. Morgan finally got to go into space in 2007 on the shuttle Endeavour on a mission to the International Space Station.

All images from NASA // Public Domain

This article originally ran in 2016.

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iStock // Ekaterina Minaeva
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Man Buys Two Metric Tons of LEGO Bricks; Sorts Them Via Machine Learning
May 21, 2017
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iStock // Ekaterina Minaeva

Jacques Mattheij made a small, but awesome, mistake. He went on eBay one evening and bid on a bunch of bulk LEGO brick auctions, then went to sleep. Upon waking, he discovered that he was the high bidder on many, and was now the proud owner of two tons of LEGO bricks. (This is about 4400 pounds.) He wrote, "[L]esson 1: if you win almost all bids you are bidding too high."

Mattheij had noticed that bulk, unsorted bricks sell for something like €10/kilogram, whereas sets are roughly €40/kg and rare parts go for up to €100/kg. Much of the value of the bricks is in their sorting. If he could reduce the entropy of these bins of unsorted bricks, he could make a tidy profit. While many people do this work by hand, the problem is enormous—just the kind of challenge for a computer. Mattheij writes:

There are 38000+ shapes and there are 100+ possible shades of color (you can roughly tell how old someone is by asking them what lego colors they remember from their youth).

In the following months, Mattheij built a proof-of-concept sorting system using, of course, LEGO. He broke the problem down into a series of sub-problems (including "feeding LEGO reliably from a hopper is surprisingly hard," one of those facts of nature that will stymie even the best system design). After tinkering with the prototype at length, he expanded the system to a surprisingly complex system of conveyer belts (powered by a home treadmill), various pieces of cabinetry, and "copious quantities of crazy glue."

Here's a video showing the current system running at low speed:

The key part of the system was running the bricks past a camera paired with a computer running a neural net-based image classifier. That allows the computer (when sufficiently trained on brick images) to recognize bricks and thus categorize them by color, shape, or other parameters. Remember that as bricks pass by, they can be in any orientation, can be dirty, can even be stuck to other pieces. So having a flexible software system is key to recognizing—in a fraction of a second—what a given brick is, in order to sort it out. When a match is found, a jet of compressed air pops the piece off the conveyer belt and into a waiting bin.

After much experimentation, Mattheij rewrote the software (several times in fact) to accomplish a variety of basic tasks. At its core, the system takes images from a webcam and feeds them to a neural network to do the classification. Of course, the neural net needs to be "trained" by showing it lots of images, and telling it what those images represent. Mattheij's breakthrough was allowing the machine to effectively train itself, with guidance: Running pieces through allows the system to take its own photos, make a guess, and build on that guess. As long as Mattheij corrects the incorrect guesses, he ends up with a decent (and self-reinforcing) corpus of training data. As the machine continues running, it can rack up more training, allowing it to recognize a broad variety of pieces on the fly.

Here's another video, focusing on how the pieces move on conveyer belts (running at slow speed so puny humans can follow). You can also see the air jets in action:

In an email interview, Mattheij told Mental Floss that the system currently sorts LEGO bricks into more than 50 categories. It can also be run in a color-sorting mode to bin the parts across 12 color groups. (Thus at present you'd likely do a two-pass sort on the bricks: once for shape, then a separate pass for color.) He continues to refine the system, with a focus on making its recognition abilities faster. At some point down the line, he plans to make the software portion open source. You're on your own as far as building conveyer belts, bins, and so forth.

Check out Mattheij's writeup in two parts for more information. It starts with an overview of the story, followed up with a deep dive on the software. He's also tweeting about the project (among other things). And if you look around a bit, you'll find bulk LEGO brick auctions online—it's definitely a thing!

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8 Common Dog Behaviors, Decoded
May 25, 2017
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iStock

Dogs are a lot more complicated than we give them credit for. As a result, sometimes things get lost in translation. We’ve yet to invent a dog-to-English translator, but there are certain behaviors you can learn to read in order to better understand what your dog is trying to tell you. The more tuned-in you are to your dog’s emotions, the better you’ll be able to respond—whether that means giving her some space or welcoming a wet, slobbery kiss. 

1. What you’ll see: Your dog is standing with his legs and body relaxed and tail low. His ears are up, but not pointed forward. His mouth is slightly open, he’s panting lightly, and his tongue is loose. His eyes? Soft or maybe slightly squinty from getting his smile on.

What it means: “Hey there, friend!” Your pup is in a calm, relaxed state. He’s open to mingling, which means you can feel comfortable letting friends say hi.

2. What you’ll see: Your dog is standing with her body leaning forward. Her ears are erect and angled forward—or have at least perked up if they’re floppy—and her mouth is closed. Her tail might be sticking out horizontally or sticking straight up and wagging slightly.

What it means: “Hark! Who goes there?!” Something caught your pup’s attention and now she’s on high alert, trying to discern whether or not the person, animal, or situation is a threat. She’ll likely stay on guard until she feels safe or becomes distracted.

3. What you’ll see: Your dog is standing, leaning slightly forward. His body and legs are tense, and his hackles—those hairs along his back and neck—are raised. His tail is stiff and twitching, not swooping playfully. His mouth is open, teeth are exposed, and he may be snarling, snapping, or barking excessively.

What it means: “Don’t mess with me!” This dog is asserting his social dominance and letting others know that he might attack if they don’t defer accordingly. A dog in this stance could be either offensively aggressive or defensively aggressive. If you encounter a dog in this state, play it safe and back away slowly without making eye contact.

4. What you’ll see: As another dog approaches, your dog lies down on his back with his tail tucked in between his legs. His paws are tucked in too, his ears are flat, and he isn’t making direct eye contact with the other dog standing over him.

What it means: “I come in peace!” Your pooch is displaying signs of submission to a more dominant dog, conveying total surrender to avoid physical confrontation. Other, less obvious, signs of submission include ears that are flattened back against the head, an avoidance of eye contact, a tongue flick, and bared teeth. Yup—a dog might bare his teeth while still being submissive, but they’ll likely be clenched together, the lips opened horizontally rather than curled up to show the front canines. A submissive dog will also slink backward or inward rather than forward, which would indicate more aggressive behavior.

5. What you’ll see: Your dog is crouching with her back hunched, tail tucked, and the corner of her mouth pulled back with lips slightly curled. Her shoulders, or hackles, are raised and her ears are flattened. She’s avoiding eye contact.

What it means: “I’m scared, but will fight you if I have to.” This dog’s fight or flight instincts have been activated. It’s best to keep your distance from a dog in this emotional state because she could attack if she feels cornered.

6. What you’ll see: You’re staring at your dog, holding eye contact. Your dog looks away from you, tentatively looks back, then looks away again. After some time, he licks his chops and yawns.

What it means: “I don’t know what’s going on and it’s weirding me out.” Your dog doesn’t know what to make of the situation, but rather than nipping or barking, he’ll stick to behaviors he knows are OK, like yawning, licking his chops, or shaking as if he’s wet. You’ll want to intervene by removing whatever it is causing him discomfort—such as an overly grabby child—and giving him some space to relax.

7. What you’ll see: Your dog has her front paws bent and lowered onto the ground with her rear in the air. Her body is relaxed, loose, and wiggly, and her tail is up and wagging from side to side. She might also let out a high-pitched or impatient bark.

What it means: “What’s the hold up? Let’s play!” This classic stance, known to dog trainers and behaviorists as “the play bow,” is a sign she’s ready to let the good times roll. Get ready for a round of fetch or tug of war, or for a good long outing at the dog park.

8. What you’ll see: You’ve just gotten home from work and your dog rushes over. He can’t stop wiggling his backside, and he may even lower himself into a giant stretch, like he’s doing yoga.

What it means: “OhmygoshImsohappytoseeyou I love you so much you’re my best friend foreverandeverandever!!!!” This one’s easy: Your pup is overjoyed his BFF is back. That big stretch is something dogs don’t pull out for just anyone; they save that for the people they truly love. Show him you feel the same way with a good belly rub and a handful of his favorite treats.

The best way to say “I love you” in dog? A monthly subscription to BarkBox. Your favorite pup will get a package filled with treats, toys, and other good stuff (and in return, you’ll probably get lots of sloppy kisses). Visit BarkBox to learn more.

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