QUES: The properties of matter depend on the types of atoms that matter is made of. Matter can exist in two forms. It can be a pure substance. This means it is not mixed with anything. It can also be a combination of different substances. This means it can be a mix of different types of atoms. You may recall that atoms differ based on the numbers of protons they contain. Some atoms contain only one proton such as Hydrogen. Other atoms contain many protons. There are many types of atoms. For example, Helium has two protons. An Oxygen atom has eight. Water is composed of a two types of atoms. Water is made of two Hydrogen atoms and one Oxygen atoms. There are only so many types of atoms. These atoms can be mixed into an almost limitless amount of substances. So what do we call a substance that has only a single type of atom?
Do you have any questions?
MY QUESTION: Do some atoms have many protons, while others have very few?

QUES: The only home Hamilton ever owned was a Federal style mansion designed by John McComb Jr., which he built on his 32-acre country estate in Hamilton Heights in upper Manhattan. He named the house, which was completed in 1802, the "Grange" after his grandfather Alexander's estate in Ayrshire, Scotland. The house remained in the family until 1833 when his widow sold it to Thomas E. Davis, a British born real estate developer, for $25,000. Part of the proceeds were used by Eliza to purchase a new townhouse from Davis (Hamilton-Holly House) in Greenwich Village with her son Alexander. The Grange, first moved from its original location in 1889, was moved again in 2008 to a spot in St. Nicholas Park on land that was once part of the Hamilton estate, in Hamilton Heights, a neighborhood in upper Manhattan. The historic structure was restored to its original 1802 appearance in 2011, and is maintained by the National Park service as Hamilton Grange National Memorial. Alexander Hamilton served as one of the first trustees of the Hamilton-Oneida Academy in New York state. Later the Academy received a college charter in 1812, and the school was formally renamed Hamilton College.Columbia University, Hamilton's alma mater, has official memorials to Hamilton on its campus in New York City. The college's main classroom building for the humanities is Hamilton Hall, and a large statue of Hamilton stands in front of it. The university press has published his complete works in a multivolume letterpress edition. Columbia University's student group for ROTC cadets and Marine officer candidates is named the Alexander Hamilton Society.
Do you have any questions?
MY QUESTION: The home that Hamilton owned, which was completed in 1802, what was the styled of the house?

QUES: Force is a vector. What then is a vector? Think about how you would give directions to a friend. You would not say, just walk half a mile. The person may walk a half mile in the wrong direction! More information is needed. You may say, follow this particular road for a half mile. You may say, look for the green house on Sumter St. In both examples, you provided a direction. You also gave the distance. In other words, you provided a vector. You did not just give a distance. Both pieces of information are needed to find a location. This is just like describing forces. To explain forces, both size and direction are needed. Notice the girl in Figure 1.1. She is pushing the swing away from herself. Thats the direction of the force. She can give the swing a strong push or a weak push.
Do you have any questions?
MY QUESTION: What two pieces of information does a vector provide?

QUES: (Financial Times) -- The increasing amount of personal information that can been gleaned by computer programs that track how people use Facebook has been revealed by an extensive academic study. Such programmes can discern undisclosed private information such as Facebook users' sexuality, drug-use habits and even whether their parents separated when they were young, according to the study by Cambridge university academics. In one of the biggest studies of its kind, scientists from the university's psychometrics team and a Microsoft-funded research centre analysed data from 58,000 Facebook users to predict traits and other information that were not provided in their profiles. The algorithms were 88 per cent accurate in predicting male sexual orientation, 95 per cent for race and 80 per cent for religion and political leanings. Personality types and emotional stability were also predicted with accuracy ranging from 62-75 per cent. Facebook declined to comment. The study highlights growing concerns about social networks and how data trails can be mined for sensitive information, even when people attempt to keep information about themselves private. Less than 5 per cent of users predicted to be gay, for example, were connected with explicitly gay groups. Michal Kosinksi, one of the report's authors, told the Financial Times that the university's techniques could easily be replicated by companies to infer personal attributes a person did not wish to share, such as sexual orientation or political views: "We used very simple and generic methods. Marketing companies and internet companies could spend much more time and resources, and hence get much higher accuracy than we did." Last week , the EU agreed to water down proposals for a radical overhaul of data privacy regulation. The move reflects governments' reluctance to impede internet businesses that might spur economic growth, and follows fierce lobbying from technology companies including Facebook and Google. Personal data has become big business. Wonga, the UK online lender, makes credit judgments within seconds based on thousands of pieces of information, including an applicant's Facebook profile. Tesco, the supermarket chain, this month started to use its customers' shopping histories to sell targeted online advertising. The report also revealed some unexpected correlations -- such as people who liked 'curly fries' having higher IQs, while those who like Facebook's "Sliding on Floors With Your Socks On" page were unlikely to use drugs.
Do you have any questions?
MY QUESTION:
According to the study by Cambridge Academics how accurately were they able to predict sexuality?