There are 20 people in a room every person must shake hands with every other person in the room. How many hand shakes have taken place?

There are 190 hand shakes taking place in this problem.

How can you be sure that there is an actual person at the other end of the chat line?

I can be sure if another person is at the other end of the chat line by going online. It's very straightforward there are no boundaries to chat with an actual person at the other end line of the line. For example, on Facebook you have an option to chat online or chat offline. If they are chatting online, then chat with them. If they are chatting offline, then there is no point in chatting at all.

What is a computer program?

A computer program performs specific tasks for a computer. A computer requires programs to function. They may be categorized along functional lines.

How are google & stumble similar? How are they different? What would you use each one for?

Google is a search engine for surfing the web, and stumble is a discovery engine that finds the best of the web. Google allows you to search the web, watch videos, and etc. StumbleUpon allows you to chat with your friends, connect to what you like (sports, music), and etc. I always use google for Facebook, for homework, and for YouTube. I haven't experienced a StumbleUpon because I made one yesterday.

What criteria would you sue to evaluate the authenticity and credibility of the information in a web site?

I would check the information given on the website everyday. If it doesn't apply to what I'm searching for, then I would close the website. I ONLY go on YouTube and iTunes on my spare time. On school nights, I would go on Facebook to ask my friends about homework and Microsoft Word for typing a lab report. Sometimes the sources I use provide the best information it gives me because it's evaluates if the website is credible or not.

Can you believe everything you see or read on the internet? How can you tell truth from misinformation?

You don't have to believe everything you see or read on the internet because there are some sites where you can read different information and see different information. For example, Wikipedia has some information about common people, common places, and common things may be true and some information may be false. People watch YouTube and it allows you to believe in different aspects of the worldwide web. To tell truth from misinformation, the spelling of what you're searching for on the internet.

How do you search engines like Google work? How do they find the web pages you want to view?

Google search engines work in many ways. It can search for web, images, mail, videos, YouTube, etc because it is international and many users love the fact that it's a secondary source of information. Google search finds web pages by typing what you are going to search and it will give you the information with a blink of an eye. A ton of users search on Facebook and YouTube because they are huge phenomenonal sites that are popular.