Roberto Abraham Scaruffi

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How can this person stay in the air? Michael Ford, Figuring things out 341 votes This example of a levitation trick is very well done. I don't know if there are other ways to do this, but this picture below gives sort of an X-ray view into the most comm... Read More » How should a 24-year-old invest time? RyzVan Rashid, Love life and everything with it. 10.0k votes (8k+ Upvotes in 7 days... I'm truly humbled. Thank you.) When I was 22 years old, I spent time going out with my friends, talking to my girlfriend all the time, spending t... Read More » Does Mark Zuckerberg or Facebook employees have a "skeleton key" granting them access to every member's Facebook profile page and information? Joe Sullivan, Chief Security Officer at Facebook 2.8k votes I'm Facebook's Chief Security Officer and I oversee data security at the company. Thanks for the question. We take our role as stewards of people's information very serious... Read More » What are some advantages to living in China compared to living in the US? Lauren Windle, expat living in Shanghai since 2010 655 votes 1. Your salary. I get paid pretty much equal to what I would in the USA ($40-45k) as a history teacher at a local school, which includes a stipend for housing and round-tri... Read More » How do casinos catch card counters? Ben Mezrich 216 votes Interesting question. They actually employ former card counters and have them sit in the security booths and watch players via the security cameras. If they see a lone car... Read More » What are the stupidest decisions ever made in Silicon Valley? Marc Bodnick, Co-Founder, Elevation Partners 283 votes Here are four high-profile decisions which are widely considered to have been terrible (three of which involve Yahoo): Yahoo not putting a heart-stopper of a bid on the tab...  Read More » What's the easiest way to learn machine learning? Michal Wolski 497 votes There really is no easy way. If you're only interested in learning the basics then you can get away with online lectures. There's plenty of good ones out there. Here's a ... Read More » Is C still important in computer science? Why? Tim Willis 397 votes I still consider C the most important of all computer languages for several reasons: - About 98% of all processors sold this year (2014) will be used in embedded applicati... Read More » Why is there such a strong correlation between geographic distance from the equator and prosperity? Sam Tanzer, Looked at some numbers 426 votes The correlation is there. I was surprised by the assumptions in the initial answer. New Zealand and Australia are among the world's wealthiest countries, and although Chile... Read More » A jar has 1000 coins, of which 999 are fair and 1 is double headed. Pick a coin at random, and toss it 10 times. Given that you see 10 heads, what is the probability that the next toss of that coin is also a head? Joe Wade 100 votes About 75%. The probability of picking the double headed coin is 1/1000, which is then certain to give 10 consecutive heads. The chance of picking the biased coin and getti... Read More »