You have 2 balls with identical diameter and weight. One is solid, one is hollow. You can't tell by kn… by Emily Liu

Answer by Emily Liu:

One simple way to find out is to release both balls at the top of an incline. The ball that reaches the bottom first is the solid sphere.

Because the balls have equal size and mass, the only difference between them is the moment of inertia, [math]I[/math], which is the rotational analogue to mass. The moment of inertia is inherent to the shape of an object and is expresses the object’s tendency to resist angular acceleration. Solid spheres have [math]I=\frac{2}{5}MR^2[/math], and hollow spheres have [math]I=\frac{2}{3}MR^2[/math], where M = mass of the sphere and R = radius of the sphere. (You can find a more comprehensive list here:…). Although we can’t assume that the balls in the question are perfect solid or hollow spheres, we can assume that comparatively, the hollow ball will have a greater moment of inertia than the solid ball due to its shape.

When you place both balls at the same height at the top of an incline, they begin with the same gravitational potential energy. When the balls are released from rest, this potential energy is converted into translational kinetic energy and rotational kinetic energy, assuming no energy is lost through other energy transfers like sound or heat:

[math]U= mgh = \frac{1}{2}mv^2 + \frac{1}{2}I\omega^2[/math]

Both balls have the same mass and radius. However, because the solid ball has a smaller moment of inertia, less of the initial mechanical energy is spent on rotating the ball. Thus, more mechanical energy is spent translating the ball downward, it will reach a greater translational velocity, and it will reach the bottom of the incline sooner.

You have 2 balls with identical diameter and weight. One is solid, one is hollow. You can't tell by knocking on them. How can you find th…

Have you ever met a psychopath or sociopath? What was it like? by Jennifer Monroe

Answer by Jennifer Monroe:

My foster sister is a sociopath. It’s surreal. The word gets tossed around and people think they know what it means. I brought a friend with me to visit my sister. He’s a pretty worldly guy who has met all sorts of people. He thought he understood when I told him that my sister was a sociopath. He didn’t. There’s not really any way to adequately explain it. It really has to be experienced. People understand self-centeredness and they think that’s what I am talking about, in an extreme form. But to meet someone who truly is unable to accept that others are human beings is a singular experience.
I think what surprises some is that my sister can be exceptionally kind. People aren’t expecting that. But she’s only kind because it serves her to be kind. She has no consideration for the person she is being kind to, that person is beside the point. The point is that she likes being praised and rewarded and counted on. And she’s learned to be kind in order to get that. She has no actual concern for the receiver of her kindness and will withdraw all kindness when she tires of it.
The other surprising thing is that my sister can be exceptionally cruel. People think they expect that. But the level of cruelty my sister can reach is almost unimaginable. But that’s not the surprising part of her cruelty, the surprising part is that she is cruel as a matter of course. It’s not an active, planned out cruelty. It’s a casual, everyday action for her that is cruel beyond measure to others. She’s not being a bitch. She’s not being malicious. She honestly has no clue that what she does is cruel because it is not a cruelty aimed at her and she has no concept that other people are real. We mean nothing to her, so there’s no point in actively hurting someone as their pain isn’t real to her. It’s a strange concept that one usually has to experience to understand.

Have you ever met a psychopath or sociopath? What was it like?

How does growing up without a father affect the daughter? by Tiffiany Chére

Answer by Tiffiany Chére:

Growing up without a father f***ing blows. I’ll just give it to you straight. Fathers are important to daughters in many ways; most importantly, they shape the daughter’s view of all men and set the standard for how these daughters will interact with men going forward (eg dating, having male colleagues & friends, etc).

If your girlfriend grew up without a father (or father figure), she is likely highly independent, leery of being able to fully trust men (including you), and likely has some unresolved issues with males in general.

For her, my biggest recommendation would be to seek counseling and work through her daddy issues because these are very real. And unresolved issues of this sort will manifest in some way, shape, or form in your marriage at some point.

For you, my biggest recommendation would be to be consistent with your girlfriend & be there for her. She is likely accustomed to not being able to rely upon men and/or having them disappoint her. If you say you’re going to pickup X from the store—do it. If you say you’re going to take Y day off from work so you guys can go out of town—do it. If you want her to trust you, be trustworthy & be consistent. Let your word be gold. With time, she will see, at least one man in her life has been & will be there for her.

This is what girls without fathers need; one man to help change their perspective on the one man who was supposed to do that but let them down—their fathers.

How does growing up without a father affect the daughter?

Dieter Rams

Saturday 2nd July 2016

I just backed RAMS: The First Feature Documentary About Dieter Rams on @Kickstarter

25 Aprile

Monday 25th April 2016

Auguri Marco !

Artemide .. 13marzo

Sunday 13th March 2016

21 feb

Sunday 21st February 2016

10 FEB

Sunday 21st February 2016

31 Gennaio

Sunday 31st January 2016

Cielo d’alba di ferragosto.

Saturday 15th August 2015

I am honored to be with you today at your commencement from one of the finest universities in the world. I never graduated from college. Truth be told, this is the closest I’ve ever gotten to a college graduation. Today I want to tell you three stories from my life. That’s it. No big deal. Just three stories.

The first story is about connecting the dots.

I dropped out of Reed College after the first 6 months, but then stayed around as a drop-in for another 18 months or so before I really quit. So why did I drop out?

It started before I was born. My biological mother was a young, unwed college graduate student, and she decided to put me up for adoption. She felt very strongly that I should be adopted by college graduates, so everything was all set for me to be adopted at birth by a lawyer and his wife. Except that when I popped out they decided at the last minute that they really wanted a girl. So my parents, who were on a waiting list, got a call in the middle of the night asking: “We have an unexpected baby boy; do you want him?” They said: “Of course.” My biological mother later found out that my mother had never graduated from college and that my father had never graduated from high school. She refused to sign the final adoption papers. She only relented a few months later when my parents promised that I would someday go to college.

And 17 years later I did go to college. But I naively chose a college that was almost as expensive as Stanford, and all of my working-class parents’ savings were being spent on my college tuition. After six months, I couldn’t see the value in it. I had no idea what I wanted to do with my life and no idea how college was going to help me figure it out. And here I was spending all of the money my parents had saved their entire life. So I decided to drop out and trust that it would all work out OK. It was pretty scary at the time, but looking back it was one of the best decisions I ever made. The minute I dropped out I could stop taking the required classes that didn’t interest me, and begin dropping in on the ones that looked interesting.

It wasn’t all romantic. I didn’t have a dorm room, so I slept on the floor in friends’ rooms, I returned coke bottles for the 5¢ deposits to buy food with, and I would walk the 7 miles across town every Sunday night to get one good meal a week at the Hare Krishna temple. I loved it. And much of what I stumbled into by following my curiosity and intuition turned out to be priceless later on. Let me give you one example:

Reed College at that time offered perhaps the best calligraphy instruction in the country. Throughout the campus every poster, every label on every drawer, was beautifully hand calligraphed. Because I had dropped out and didn’t have to take the normal classes, I decided to take a calligraphy class to learn how to do this. I learned about serif and san serif typefaces, about varying the amount of space between different letter combinations, about what makes great typography great. It was beautiful, historical, artistically subtle in a way that science can’t capture, and I found it fascinating.

None of this had even a hope of any practical application in my life. But ten years later, when we were designing the first Macintosh computer, it all came back to me. And we designed it all into the Mac. It was the first computer with beautiful typography. If I had never dropped in on that single course in college, the Mac would have never had multiple typefaces or proportionally spaced fonts. And since Windows just copied the Mac, it’s likely that no personal computer would have them. If I had never dropped out, I would have never dropped in on this calligraphy class, and personal computers might not have the wonderful typography that they do. Of course it was impossible to connect the dots looking forward when I was in college. But it was very, very clear looking backwards ten years later.

Again, you can’t connect the dots looking forward; you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. You have to trust in something — your gut, destiny, life, karma, whatever. This approach has never let me down, and it has made all the difference in my life.

My second story is about love and loss.

I was lucky — I found what I loved to do early in life. Woz and I started Apple in my parents garage when I was 20. We worked hard, and in 10 years Apple had grown from just the two of us in a garage into a $2 billion company with over 4000 employees. We had just released our finest creation — the Macintosh — a year earlier, and I had just turned 30. And then I got fired. How can you get fired from a company you started? Well, as Apple grew we hired someone who I thought was very talented to run the company with me, and for the first year or so things went well. But then our visions of the future began to diverge and eventually we had a falling out. When we did, our Board of Directors sided with him. So at 30 I was out. And very publicly out. What had been the focus of my entire adult life was gone, and it was devastating.

I really didn’t know what to do for a few months. I felt that I had let the previous generation of entrepreneurs down – that I had dropped the baton as it was being passed to me. I met with David Packard and Bob Noyce and tried to apologize for screwing up so badly. I was a very public failure, and I even thought about running away from the valley. But something slowly began to dawn on me — I still loved what I did. The turn of events at Apple had not changed that one bit. I had been rejected, but I was still in love. And so I decided to start over.

I didn’t see it then, but it turned out that getting fired from Apple was the best thing that could have ever happened to me. The heaviness of being successful was replaced by the lightness of being a beginner again, less sure about everything. It freed me to enter one of the most creative periods of my life.

During the next five years, I started a company named NeXT, another company named Pixar, and fell in love with an amazing woman who would become my wife. Pixar went on to create the worlds first computer animated feature film, Toy Story, and is now the most successful animation studio in the world. In a remarkable turn of events, Apple bought NeXT, I returned to Apple, and the technology we developed at NeXT is at the heart of Apple’s current renaissance. And Laurene and I have a wonderful family together.

I’m pretty sure none of this would have happened if I hadn’t been fired from Apple. It was awful tasting medicine, but I guess the patient needed it. Sometimes life hits you in the head with a brick. Don’t lose faith. I’m convinced that the only thing that kept me going was that I loved what I did. You’ve got to find what you love. And that is as true for your work as it is for your lovers. Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven’t found it yet, keep looking. Don’t settle. As with all matters of the heart, you’ll know when you find it. And, like any great relationship, it just gets better and better as the years roll on. So keep looking until you find it. Don’t settle.

My third story is about death.

When I was 17, I read a quote that went something like: “If you live each day as if it was your last, someday you’ll most certainly be right.” It made an impression on me, and since then, for the past 33 years, I have looked in the mirror every morning and asked myself: “If today were the last day of my life, would I want to do what I am about to do today?” And whenever the answer has been “No” for too many days in a row, I know I need to change something.

Remembering that I’ll be dead soon is the most important tool I’ve ever encountered to help me make the big choices in life. Because almost everything — all external expectations, all pride, all fear of embarrassment or failure – these things just fall away in the face of death, leaving only what is truly important. Remembering that you are going to die is the best way I know to avoid the trap of thinking you have something to lose. You are already naked. There is no reason not to follow your heart.

About a year ago I was diagnosed with cancer. I had a scan at 7:30 in the morning, and it clearly showed a tumor on my pancreas. I didn’t even know what a pancreas was. The doctors told me this was almost certainly a type of cancer that is incurable, and that I should expect to live no longer than three to six months. My doctor advised me to go home and get my affairs in order, which is doctor’s code for prepare to die. It means to try to tell your kids everything you thought you’d have the next 10 years to tell them in just a few months. It means to make sure everything is buttoned up so that it will be as easy as possible for your family. It means to say your goodbyes.

I lived with that diagnosis all day. Later that evening I had a biopsy, where they stuck an endoscope down my throat, through my stomach and into my intestines, put a needle into my pancreas and got a few cells from the tumor. I was sedated, but my wife, who was there, told me that when they viewed the cells under a microscope the doctors started crying because it turned out to be a very rare form of pancreatic cancer that is curable with surgery. I had the surgery and I’m fine now.

This was the closest I’ve been to facing death, and I hope it’s the closest I get for a few more decades. Having lived through it, I can now say this to you with a bit more certainty than when death was a useful but purely intellectual concept:

No one wants to die. Even people who want to go to heaven don’t want to die to get there. And yet death is the destination we all share. No one has ever escaped it. And that is as it should be, because Death is very likely the single best invention of Life. It is Life’s change agent. It clears out the old to make way for the new. Right now the new is you, but someday not too long from now, you will gradually become the old and be cleared away. Sorry to be so dramatic, but it is quite true.

Your time is limited, so don’t waste it living someone else’s life. Don’t be trapped by dogma — which is living with the results of other people’s thinking. Don’t let the noise of others’ opinions drown out your own inner voice. And most important, have the courage to follow your heart and intuition. They somehow already know what you truly want to become. Everything else is secondary.

When I was young, there was an amazing publication called The Whole Earth Catalog, which was one of the bibles of my generation. It was created by a fellow named Stewart Brand not far from here in Menlo Park, and he brought it to life with his poetic touch. This was in the late 1960’s, before personal computers and desktop publishing, so it was all made with typewriters, scissors, and polaroid cameras. It was sort of like Google in paperback form, 35 years before Google came along: it was idealistic, and overflowing with neat tools and great notions.

Stewart and his team put out several issues of The Whole Earth Catalog, and then when it had run its course, they put out a final issue. It was the mid-1970s, and I was your age. On the back cover of their final issue was a photograph of an early morning country road, the kind you might find yourself hitchhiking on if you were so adventurous. Beneath it were the words: “Stay Hungry. Stay Foolish.” It was their farewell message as they signed off. Stay Hungry. Stay Foolish. And I have always wished that for myself. And now, as you graduate to begin anew, I wish that for you.

Stay Hungry. Stay Foolish.

Thank you all very much.


Tuesday 2nd June 2015

Cielo MediaWorld

Sunday 19th April 2015


Saturday 18th April 2015

Eurostile is one of the most important designs from the Italian font designer Aldo Novarese. It was originally produced in 1962 by the Nebiolo foundry as a more complete version of the earlier Microgramma, a caps-only font designed by Novarese and A. Butti.

Eurostile reflects the flavor and spirit of the 1950s and 1960s. It has big, squarish shapes with rounded corners that look like television sets from that era. Eurostile has sustained the ability to give text a dynamic, technological aura. It works well for headlines and small bodies of text.

(Adobe) Garamond
Times New Roman
Mrs Eaves
Bauer Bodoni
Franklin Gothic
News Gothic
Helvetica Neue
Copperplate Gothic

primo marzo

Sunday 1st March 2015

25 Feb .. sereno d’inverno

Wednesday 25th February 2015


Friday 20th February 2015


Thursday 19th February 2015

Scuse infinite … in english

Tuesday 17th February 2015


Thank you for your post and please accept our apologies for the response time.

I have checked your case and took the ownership over it,
so be sure from now on you will receive ongoing immediate assistance.

I’m really sorry for this inconvenience, and would like to sincerely apologize for it.
I completely share your concern and will do my best to speed up the process of resolution.





Buon Compleanno, Anna!

Monday 16th February 2015

16 febbraio 2015 .. Dodici anni!

… she was high on cocaine ..

Sunday 14th December 2014

Song For Sharon

For many fans, especially women, this is the album’s tour de force.

It was mostly written, Mitchell says, while she was high on cocaine at the end of a long day in New York during which she ferried to Staten Island to buy a mandolin and visited a fortune-teller on Bleeker Street to see if there was any hope for her love life.

Both incidents turn up in the song, a wistful eight-and-a-half-minute open letter to childhood friend Sharon Bell that meanders over the Saskatchewan flatlands and through small towns, big cities, lost dreams, and life’s choices.

As kids, Mitchell longed for married life on a farm and Bell for success as a singer. When things turned out precisely in reverse, Mitchell says, Bell resented her fame while she envied her old friend’s close family life.

The two women haven’t been in touch since they were teens, but after the song came out, Mitchell says, Bell went to Saskatoon and made a recording of her own songs.

“She was always a beautiful singer. She made the recording not so much for commercial reasons but just to have a record of her own to distribute among family and friends.”

cielo e canneto, october 23rd

Thursday 23rd October 2014


cielo 23 OCT ;-)

Thursday 23rd October 2014


cielo Milano d’Ottobre .. uhm!

Wednesday 8th October 2014


cielo SUNDAY 6:50 pm .. OCT

Sunday 5th October 2014


cielo 02 OCT, 18:40 ..

Thursday 2nd October 2014


cielo 1st OCT, 16:45 !

Wednesday 1st October 2014


Ciao, ciao estate!

Tuesday 30th September 2014

per noi l’estate finiva il 30 settembre..


Auguri Marco!

Sunday 28th September 2014

.. e buona festa fatta!

cielo sereno –

Thursday 25th September 2014


cielo .. di settembre.

Tuesday 23rd September 2014


cielo fantastico, september at 6 p.m.

Monday 22nd September 2014


cielo grigio september.

Thursday 18th September 2014


cielo fantastico.

Friday 12th September 2014

cielo normale.

Wednesday 10th September 2014


cielo di Berkeley, CA

Thursday 4th September 2014


cielo Lake Tahoe

Wednesday 3rd September 2014

cielo Highway 395, CA

Tuesday 2nd September 2014

Los Angeles Sky

Monday 1st September 2014

cielo Barstow, CA

Sunday 31st August 2014

cielo Death Valley

Saturday 30th August 2014

cielo Yosemite

Friday 29th August 2014

cielo Palo Alto

Thursday 28th August 2014


Friday 15th August 2014

cielo Forlì, today.

Thursday 14th August 2014

13 AGO –

Wednesday 13th August 2014

post without photo

cielo che forse arriva l’estate.

Tuesday 12th August 2014

11 AGO –

Monday 11th August 2014

post without photo

10 AGO –

Sunday 10th August 2014

post without photo

9 AGO –

Saturday 9th August 2014

post without photo

Sky from the top, at dusk.

Friday 8th August 2014

cielo con nuvola solitaria.

Tuesday 5th August 2014

cielo aereo ..

Monday 4th August 2014

cielo di casa.

Sunday 3rd August 2014

cielo di sera e mezzaluna.

Saturday 2nd August 2014

cielo alitalia fila 15

Friday 1st August 2014

cielo alle 8:30pm

Thursday 31st July 2014

cielo che volge al bello..

Wednesday 30th July 2014

cielo caldo.

Tuesday 29th July 2014

sunset in Luglio

Monday 28th July 2014

cielo estivo di milano.

Sunday 27th July 2014

cielo nuvoloso di luglio

Saturday 26th July 2014

cielo con nuvola single

Friday 25th July 2014

weather today ..

Thursday 24th July 2014

un cielo così.

Tuesday 22nd July 2014

cielo tranquillo.

Sunday 20th July 2014

cielo accettabile ..

Saturday 19th July 2014

cielo alitalia, ohhh!

Friday 18th July 2014

17 JUL

Thursday 17th July 2014

Picture Not Available