In the last few years, Tumblr has become one of the most popular social networking websites. Before Tumblr was the company we know today, however, it was just one of David Karp's smaller projects. Learn more about one of the most successful young people working in tech—and how he changed the way people share who they are and what they like. Discover the story behind David Karp's success—and find out what it takes to turn a new company into something amazing.

You probably watch music videos, movie trailers, or funny clips on YouTube—but just a few years ago, YouTube was only an idea a few friends shared. One of those friends was Steve Chen. Learn about the beginning of one of the most important websites ever created. Discover the story of how Steve helped to start the biggest video site on the Internet.

Today, Facebook is one of the most-used websites on the Internet, visited by millions of users each day and home to more than 500 million accounts. Many people use Facebook to share pictures, news, and ideas with friends—but they may not know the true story behind Facebook's massive success. Facebook began as the idea of one college student: Mark Zuckerberg. Discover how Mark founded one of the most successful social networking sites on the Internet while he was still in school. Learn how he first got Facebook growing, and how he keeps millions of people logging in day after day. Find out more about the man behind Facebook—and learn what's next for his company.

Google is one of the most successful companies of the Internet age. For many people, looking up information with Google's search engine is the best way to find just what they want to know. Millions of people write and read e-mails using Google's Gmail. You can listen to music on Google Play or share a document with a friend using Google Drive. Today, Google also owns YouTube, the number-one video site on the Internet. You may use Google websites every day, but do you know the story of the men behind Google—Larry Page and Sergey Brin? Find out how Larry and Sergey started the company and how they got their first inspiration. Learn how Google grew to become the amazing success we all know today.

Become a more compassionate person—and make the world a better place. Empathy is the ability to sense other people's emotions. People with empathy are able to imagine what someone else might be thinking or feeling. They recognize and understand another's suffering. People who are compassionate, go a step further: they take action. Compassion changes the world. And it can change you as well. When you reach out to others, you not only help them; you also increase your own well-being. Researchers have found that connecting with others in a meaningful way makes you healthier, both mentally and physically. Compassion may even make you live longer. Discover ways to build your empathy and compassion!

Though you probably know the risks of using illegal drugs like cocaine and heroin, you might not know just how dangerous many over-the-counter medications can be when abused or taken incorrectly. Cough syrups, diet pills, sleeping pills, and other over-the-counter medications can be just as dangerous as many illegal drugs. Learn more about the true risks of taking these readily available drugs. Discover the downside of over-the-counter medications!

Anger is an emotional response to something that threatens your well-being in some way. Too much anger can damage your body. It can hurt your relationships with others, and it can make you unhappy and miserable. But anger can also be a powerful source of energy that pushes you toward a happier life. It's a signal that something is wrong. It tells you to pay attention—and then take action. So next time you feel angry, stop and pay attention—then use an anger-management tool to channel your angry feelings in positive ways. Let your anger empower you to change the world. Discover how inside this book!

Discover how to cope with life's surprises. Some people like to be surprised. They find it funny or exciting or simply interesting. They may seek out experiences where they're likely to encounter the unexpected. Other people, however, are uncomfortable with surprise. It may make them feel anxious or stressed. Psychologists say that people who are comfortable with surprise are more emotionally flexible than people who aren't. When life takes them by surprise, they cope without becoming upset. You can learn to be more flexible. Each time you're confronted with a surprise, tell yourself, "This is an opportunity, a chance to be curious, to be creative, to think about things differently, to accept something new." Find out more inside this book!

Methamphetamine is one of the most dangerous drugs available today. Meth and other amphetamines can seriously damage your body, ruin your relationships, and lead to prison and even death. Discover the true risks of these drugs, including the many awful effects they can have on your body, from rotting teeth to problems with your organs and brain. Find out how meth has ruined so many lives. Learn the downside of methamphetamine and other amphetamines!

Let your emotions teach you something new about yourself. Our emotions are the feelings inside our minds that come and go. Sometimes we feel happy, and sometimes we feel sad; sometimes we feel angry, sometimes we're scared, and sometimes we're bored. Positive emotions—like joy and excitement—give us the energy we need to be creative and do amazing things. Negative feelings—like grief and anger—aren't all bad either. They can teach us to stay away from things that might hurt us. Scientists are exploring the connections between our emotions, our brains, and the rest of our bodies. They know that emotions are important. The more you learn about them, the more you'll be able to use them to help you manage your entire life better. Discover more within this book!

Anger is an emotional response to something that threatens your well-being in some way. Too much anger can damage your body. It can hurt your relationships with others, and it can make you unhappy and miserable. But anger can also be a powerful source of energy that pushes you toward a happier life. It's a signal that something is wrong. It tells you to pay attention—and then take action. So next time you feel angry, stop and pay attention—then use an anger-management tool to channel your angry feelings in positive ways. Let your anger empower you to change the world. Discover how inside this book!

Stress is a normal and natural part of life. We all experience it. When we do, we often speak of feeling "tense," as though we can't relax. We feel nervous. We may get upset easily. Life seems to be coming at us too fast. There's just too much of it! Our emotions feel overwhelmed. Stress and tension put strain on your mind and body—but you don't have to let stress get you down. Look inside this book to find out what you can do to cope when life seems like too much to handle!

Become a more compassionate person—and make the world a better place. Empathy is the ability to sense other people's emotions. People with empathy are able to imagine what someone else might be thinking or feeling. They recognize and understand another's suffering. People who are compassionate, go a step further: they take action. Compassion changes the world. And it can change you as well. When you reach out to others, you not only help them; you also increase your own well-being. Researchers have found that connecting with others in a meaningful way makes you healthier, both mentally and physically. Compassion may even make you live longer. Discover ways to build your empathy and compassion!

Discover how to cope with life's surprises. Some people like to be surprised. They find it funny or exciting or simply interesting. They may seek out experiences where they're likely to encounter the unexpected. Other people, however, are uncomfortable with surprise. It may make them feel anxious or stressed. Psychologists say that people who are comfortable with surprise are more emotionally flexible than people who aren't. When life takes them by surprise, they cope without becoming upset. You can learn to be more flexible. Each time you're confronted with a surprise, tell yourself, "This is an opportunity, a chance to be curious, to be creative, to think about things differently, to accept something new." Find out more inside this book!

Most young adults know that alcohol and tobacco aren't good for them—but they may not know the real-life consequences of using these harmful substances. From coughing to cancer, from alcohol poisoning to problems with your liver, alcohol and tobacco can cause serious damage to your health. Smoking and drinking also do damage to your relationships with others and can land you in trouble with the police. Find out more about the dangerous consequences of alcohol and tobacco use. Discover the downside of alcohol and tobacco!

Though you probably know the risks of using illegal drugs like cocaine and heroin, you might not know just how dangerous many over-the-counter medications can be when abused or taken incorrectly. Cough syrups, diet pills, sleeping pills, and other over-the-counter medications can be just as dangerous as many illegal drugs. Learn more about the true risks of taking these readily available drugs. Discover the downside of over-the-counter medications!

You may have heard that marijuana is a "safe" drug. In some parts of the United States, it's even legal and while a debate continues regarding recreational and medical use, research still conclusively confirms the devastating effect on a young, undeveloped adolescent brain. Using marijuana can have very real and very scary consequences for your body and your future. Discover the true dangers of using marijuana. Find out how marijuana can hurt your relationships with the people you love and keep you from doing your best in school. Learn the downside of marijuana!

Methamphetamine is one of the most dangerous drugs available today. Meth and other amphetamines can seriously damage your body, ruin your relationships, and lead to prison and even death. Discover the true risks of these drugs, including the many awful effects they can have on your body, from rotting teeth to problems with your organs and brain. Find out how meth has ruined so many lives. Learn the downside of methamphetamine and other amphetamines!

Just because a drug is legal, doesn't mean it's safe to abuse it. Abusing prescription painkillers like OxyContin™, Percocet™, and Vicodin™ is no safer than trying much harder drugs. These drugs are being vastly abused and represent one of today's largest drug epidemics. Discover the real consequences of taking prescription painkillers to get high. Learn about the damage these pills can do to your body and how you can develop an addiction to painkillers. Find out about the downside of prescription painkillers!