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Tom Eigelsbach
Works at Hangouts/Skype Math Tutor and Science/Sci-fi Geek.
Attended Vulcan Academy of Science
Lives in Washington, DC, USA
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Tom Eigelsbach

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This is a simple problem, to find the angle marked x, though it turns out to be rather difficult if the 'aha' insight trick doesn't hit you at first. Don't cheat, and work it out yourself first, but you may find an elegant solution posted by +Jean DAVID at:

HInt below.


Hint: remember that any triangle inscribed within a circle, where the longest side of the triangle is the circle's diameter, is going to be a right triangle.

#math   #maths   #mathematics   #geometry  
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My proof was not complete, I admit !
So I have posted another picture proving the link between 30° and 50° to show that it cannot be otherwise.
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A campaign has been launched calling for a ban on the development of robots that can be used for sex.

Such a use of the technology is unnecessary and undesirable, said campaign leader Dr Kathleen Richardson. It will have the effect of "reducing all women to men," she said, when men can have drama-free sex whenever they please and won't have to change their lifestyles or barter material goods in exchange for intimacy with women. "A world without sexually frustrated men willing to sell their souls would be bad news for women everywhere," she continued.

Dr Richardson, a robot ethicist at De Montfort University in Leicester, wants to raise awareness of the issue and persuade those developing sex robots to rethink how their technology is used. She fears that men might even start to not put up with tantrums and spending sprees in exchange for sexual gratification anymore if these fembots are allowed to exist. "It would be worse than legalizing prostitution," she added.
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+Donald DiPaula, bwahahaha, that line I actually added for satire, but the person is real and she says the usual objectification of women blather, while men don't scream about being objectified when women use vibrators or dildos instead. I took the liberty of quoting what she was really thinking, rather than the blather that she told the BBC:
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This amazing VR demo video is part of the ongoing Enterprise 3D Construction project, which plans to fully create the Enterprise in 3D space and let you walk around the ship in its entirety, and even take shuttlecraft out to fly in nearby space. That’s all well and good, but it’s the fact that the project is compatible with VR now that makes this so cool: it’s not just you flying through a rendered Enterprise, it’s you walking around and looking around at stuff, like you’re a member of the crew. #startrek  
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When it comes to science, some Americans are better informed than others, according to a new survey.
When it comes to science, some Americans are better informed than others, according to a new survey.
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Kronoseismology and the Rings of Saturn

Seismology is the study of vibrations and waves through the Earth’s interior. By studying how vibrations are transmitted through the Earth we can study the structure of the Earth as a whole. Similar methods have been applied to the Sun, known as helioseismology, and through it we have an understanding of things such as the temperature and pressure of the Sun’s core. We’ve also been able to study some stars in this way (asteroseismology) from which we can determine things like a star’s age. While it’s a powerful tool, seismology methods pose a challenge for gas planets. But because Saturn has a complex ring system, its vibrations can be measured indirectly. The process is known as Kronoseismology.

If Saturn were a static mass, then the motion chunks of rock and ice that make up its rings would depend largely on the gravitational interactions between each other. But because Saturn is vibrating its gravitational field oscillates, and this induces wave patterns within Saturn’s rings. These patterns are subtle and difficult to observe, but in recent years we’ve been able to watch these changing patterns.

The patterns are measured using the Cassini spacecraft orbiting Saturn. As Cassini orbits Saturn, it’s view of background stars are often occulted by the rings of Saturn. By observing a star as the rings pass in front of it, we can gather information how thick the rings are in a particular area. This is what a team did for Saturn’s C-ring. From the data they were able to deduce 6 wave patterns that oscillated too quickly to be caused by the gravitational tug of a Saturnian moon. Instead they are caused by the oscillations of Saturn itself.

From this data, the team was able to verify that our model of Saturn’s interior is relatively accurate, though further analysis of these patterns will help us refine the model.

Paper: M. M. Hedman and P. D. Nicholson. Kronoseismology: Using density waves in Saturn’s C ring to probe the planet’s interior. The Astronomical Journal, 146:12 (16pp), 2013.
Saturn's rings can be used to study the vibrations of Saturn's interior. The process is known as Kronoseismology.
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Water on Mars sets us up for the big question: life on Mars?
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I remember this one. It was in terms of interest rates (think of the limit below as interest being 'compounded instantly') that my favorite number of all time magically pops out at you!

#math   #mathematics   #maths  
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Well, it's about time. The judge rules that plaintiffs can't score just yet on a claim of copyright abandonment — it's a triable issue — but there's still enough in the record to give them victory on another aspect. Even if the Hill sisters still held common law rights to the lyrics when they made their later deals with Summy, the judge says there's no plausible evidence to support the theory they gave those rights to Summy Co. This dispute is hardly over, though. Among other things, the plaintiffs represented by attorneys including Randall Newman and Mark Rifkin are contending that Warner should have to return millions of dollars in licensing fees.
A judge grants summary judgment to a filmmaker challenging Warner/Chappell's copyright to a song more than a century old.
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“You should always go to other people’s funerals; otherwise, they won’t come to yours.”

Yogi Berra, one of baseball’s greatest catchers and characters, who as a player was a mainstay of 10 Yankee championship teams and as a manager led both the Yankees and Mets to the World Series — but who may be more widely known as an ungainly but lovable cultural figure, inspiring a cartoon character and issuing a seemingly limitless supply of unwittingly witty epigrams known as Yogi-isms — died on Tuesday. He was 90. Click through for a more in-depth biography. Here are some of his famous quotes:

On getting enough rest:
“I usually take a two-hour nap from one to four.”

On "fan" mail:
“Never answer an anonymous letter.”

On education:
“I’m not going to buy my kids an encyclopedia. Let them walk to school like I did.”
“You can observe a lot by watching.”

On the future:
“The future ain’t what it used to be.”

On travel:
“If you don’t know where you are going, you might wind up someplace else.”
“Why buy good luggage, you only use it when you travel.”
“The towels were so thick there I could hardly close my suitcase.”
“When you come to a fork in the road, take it.”

On social life:
"Nobody goes there anymore, it's too crowded."
“It gets late early out here.”

On youth sports:
“I think Little League is wonderful. It keeps the kids out of the house.”

On the human anatomy:
“I don’t know (if they were male or female) fans running naked across the field). They had bags over their heads.”

On receiving advice:
“Take it with a grin of salt.”

On weather:
“It ain’t the heat, it’s the humility.”

On finance:
“A nickel ain’t worth a dime anymore.”

On baseball:
“In baseball, you don’t know nothing.”
“We made too many wrong mistakes.”
“So I’m ugly. I never saw anyone hit with his face.”
“If the people don’t want to come out to the ballpark, nobody’s going to stop them.”
“Baseball is 90 percent mental. The other half is physical.”
“All pitchers are liars or crybabies.”
“We were overwhelming underdogs.”
“Bill Dickey is learning me his experience.”
“He hits from both sides of the plate. He’s amphibious.”
“I always thought that record would stand until it was broken.”
“I can see how he (Sandy Koufax) won 25 games. What I don’t understand is how he lost five.”
“I want to thank everyone for making this night necessary.”

On being thought of as a philosopher:
"I didn't really say everything I said."
A mainstay player on 10 Yankee championship teams who as a manager led the Yankees and Mets to the World Series, Berra may have been better known for his bumbling yet wise way with words.
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“The Martian is a fairly reasonable representation of challenges that we’ll be seeing in the future,” said Charles Elachi, director of JPL. The book is also now required reading for anyone working at the Johnson Space Center in Houston, Texas, according to Dr. Jim Green, the head of Planetary Exploration at NASA. 

The planetary exploration expert was even asked to give notes on the script. One example relates to the crux to the whole movie. In The Martian, Watney is stranded when he’s hit with debris during a violent dust storm on Mars. His monitor is broken, he’s presumed dead, and his team leaves. However, Green explained that Mars’ planetary conditions don’t allow dust storms to get violent enough for that kind of destruction. Since the novel was published, though, NASA has learned some Martian storms do get upwards of 30km high and can include powerful fits of lightning. Green suggested, if the film wanted to be more scientifically accurate, lightning could cause the debris.

In the finished film, the filmmakers did put some lightning into the background of the scene, but Watney’s separation from the group still happens unscientifically, when he’s hit with a broken satellite. “It’s a movie,” said Green. “For my science friends, I say ‘Check the science at the door, go in and have a great time’.”
Right now, here’s how close we are to the events of Andy Weir’s novel The Martian actually happening: Not very. NASA believes we’re probably about 20 years away from putting an astronaut on Mars, but as the movie about a astronaut being stranded on Mars hits theaters, 20 years feels longer than it sounds.
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Washington, DC, USA
Greenbelt, MD
✔ Certified Skeptic, Gamer, Philosopher, Sci-fi/Science Geek, Math Tutor
"It is in the admission of ignorance and the admission of uncertainty that there is a hope for the continuous motion of human beings in some direction that doesn't get confined, permanently blocked, as it has so many times before in various periods in the history of man." 
— Richard P. Feynman
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This is the best Indian restaurant I've ever been to. It's also the best buffet of any cuisine I know of in the DC-Baltimore area, as long as you love Indian cuisine. The serve a buffet 7 days a week at a cost of $11 or $13 on weekends. Their weekend buffets are the best, however. I had three insanely wonderful dishes last time I was at the Curry Leaf for lunch on a Saturday. An okra dish that was out of this world. Same with the eggplant dish. And an outstanding cauliflower dish. Any of those three I'd consider batter than any dish at any Indian restaurant I've ever eaten at, and they had them all. They also had meat dishes, but I don't eat meat. And a dessert that was different from the usual India desserts, but it was delicious. My one problem was I had to pull myself away when I was full, because it was so good I just wanted to eat more. And on top of that, you are allowed to bring your own beer or wine with you and there is no 'corking' fee. So while this is above average what I usually want to pay for lunch, what you save from bringing your own bottle of wine to share makes up for it, as a $10 bottle of wine will usually cost you $30 or more in a restaurant. Hence, I'll bring along some of my favorite craft beer or a good bottle of wine to share, making this both my go-to place for special occasions with friends as well as my current favorite restaurant.
• • •
Public - 8 months ago
reviewed 8 months ago
This is a great place to eat, given a couple of qualifications. It's got some really wonderful dishes that make it worthwhile. Most of the stuff they serve is mediocre and not very good, but as it's a buffet, if you know what the few really good ones are, that makes no difference, and you'll get a fantastic deal. You can take what you don't eat home, or get an extra plateful to go, or just get food to go for only $4 a pound ($6 for meat/fish). That's a great deal, and I usually get a plateful of stir-fry veggies to take home for another meal. Also, even the mediocre food is a plus if you bring finicky friends or finicky kids: they have plenty of junk food (pizza, french fries, fried chicken nuggets), plus plenty of stuff for vegans and vegetarians, plus lots of normal chinese dishes from lo mein to beef & broccoli, Everybody will like something here. The Hibachi stir fry is fantastic: you pick your own selection of veggies (and/or meats and eggs), and they have a good selection including snow peas and fresh mushrooms, and they'll cook it in front of you, and add whatever sauces you want or lots of garlic if you wish. Worth it if this is all you get. The sushi is good. Mostly California roll kinds of sushi, maybe a dozen varieties, with a couple of them vegan and several with cooked rather than raw fish. More than worth it just for the sushi alone. The salad bar is way above average, better than any of the ones you see in the supermarket for $5 or $6 a pound, with more variety, except this is all you can eat or only $4 a pound to take home, so that's worth it if you only eat salad, or bring along friends on a diet who just want to eat salad. Just order water. Soft drinks are expensive, though it's an all you can drink deal, but seriously, why the extra calories of sugar water to fill you when there's all the good food that comes with the package plan. I just get water and add lemon slices. Or maybe I'll order hot tea if I'm in the mood, but that's extra too. And I skip the desserts. There are tons of them, none that interesting, but usually at least two varieties of chocolate cake, which will make kids happy. And there are a few other really top-notch dishes, such as the string beans (always just perfectly crispy and not overcooked) or the small clams in the shell which is delicious, or the spinach and cheese dish which they hilariously always misspell as "Spanish Cheese." The rest of the stuff is mostly mediocre, but just sample and find the few really good dishes they serve, and ignore the rest, and you'll love the place. As for bad reviews and complaints about the service, all the waitress does is bring you water and take your used plates. It's a *buffet,* folks! On a rare occasion at peak hours you have to wait a minute or two in line because you pay at the start a one-price fits all, which is an amazing price, btw: $7.00 including tax with the dollar off value-pak monthly coupon in the mail, or $10.00 including tax with the coupon for $1.50 off after 3:30 for dinner or all Sunday. But if you go Sunday afternoon expect a big line to get in -- but that's because half the poor folks in that part of the county take their families there after church! They are doing a huge service to offer all this good food with tons of salad and veggies that poor families can afford instead of a greasy bucket of fried chicken at a fast food restaurant. It's the best cheap after-church family buffet in town. So it gets five stars from me. No, it's not the place to impress your date with, but it is a great place to go alone, or with a big family or group of friends where everyone will find something they like, or to get a great carry out stir fry.
• • •
Public - 8 months ago
reviewed 8 months ago
3 reviews