Roberto Abraham Scaruffi

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What is the sum of digits in the number[math]4444^{4444}[/math]? Michal Forišek, teacher, scientist, competitive programmer 151 votes By computing it directly: >>> sum( int(x) for x in str(4444**4444) ) 72601 I don't really see an easy way to find out this answer without a computer. ... Read More » What would happen if I cut down all the sugar in my diet (except fruits, honey)? Western Wings, Project manager, private pilot & plane owner 116 votes I cut sugar & red meat out of my diet almost 30 years ago. I have virtually no health issues at all, look as much as 10 years younger than my contemporaries & have never ha...  Read More » Is getting ripped worth it? Timothy Williams 218 votes Had you asked whether anything else was worth it, I would probably say "it depends". But is getting ripped worth it? Yes. Not for the reasons you might think. Nobody at th... Read More » In a Math competition, your life depended on winning it. You could choose any mathematician from any era to represent you. Who would be your choice? Craig Holland 93 votes Paul Dirac. As legend states, a professor of his in his Masters program gave him a list of 10 mathematical problems that had been considered "unsolvable" by mathematicians...  Read More » What are some great questions that university professors have received? Siddarth Koneti, PhD Candidate 408 votes when i was in school ( at the age of 9) my math teacher told us " there is no end to infinite,1,2,3,........................... ". my friend puzzled and asked a question. ...  Read More » What is it like to have a PhD and work a low-skill job unrelated to your area of study? Jacob VanWagoner, EE/physics dude. Quantum electronics and photonics, along with the regular kind. 154 votes I hear stories of the mythical PhD janitor. These are brilliant people who made significant contributions in their fields of expertise, and now have passive incomes suffic... Read More » Star Wars: The Force Awakens (2015 movie): Who are Rey's parents? Is she [spoiler]'s daughter? Helge Kåre Fauskanger 157 votes (Sort-of-spoiler:) We are not told. Episode 7 leaves her parentage unclear, but it will surely be dealt with in future installments. (Larger spoiler:) Vader fanboy Kylo Ren...  Read More » What are some math questions asked at Goldman Sachs interviews for Quant jobs? Joseph Wang, Chief Scientist, Bitquant Research 270 votes When I interviewed with them, they gave me some nasty integrals so solve. It felt like defusing a bomb, since the trick was to unwind the math operations to give you a sen...  Read More » What happens when you send food back at a restaurant? Charlie Kramer 236 votes This happened at La Sandia in Tysons Corner mall outside DC when my daughter and I stopped in for lunch. I was served the wrong meal. Knowing I'm prone to senior moments an...  Read More » What are the pros and cons of getting a PhD if I have no interest in staying in academia? Chen Shuting, Scientist 87 votes I had no interest in staying in academia when I decided to go for a Ph D oversea about 7 years ago. After five years of struggling, I finally have got a piece of paper sta... Read More »