You're at home. You can’t go out because you're busy. But you can't stop checking your phone. What's everyone else doing? Does this sound like you? Then perhaps you have FOMO—Fear of Missing Out.

"Sometimes I see a picture of some friends online, " explains Lucas 16. "They’re hanging out somewhere. I can’t go—maybe I have homework. But it makes me feel unhappy. My friends are having fun and I'm not."

About 20% of teenagers say that they get this feeling, but people of all ages experience FOMO.

For Grace, 21, her FOMO is a serious problem. "I never read or play sports now, " she explains. "I go out almost every night because I don't want to miss out. Or I sit at home and I read online about what my friends are doing. FOMO kills your interests in your spare time."

Dr. Suzanne Taylor, a psychologist(心理学家), says social networking website are not helping people with FOMO. "They're perfect for communicating with friends and relatives — all over the world. But they're full of pictures of your friends,doing exciting things. Suddenly, other people's lives look interesting and our own lives feel boring."

So how can we fight FOMO? Should we stop using social networks? "That isn't possible for many people,’’ says Dr. Taylor. "But before bed tonight, put your phone in another room. And before you go to sleep, think about the interesting things you're doing this week. And remember how lucky you are.’’

Britain was once covered by thick forests, home to many animals which no longer live here. There were wolves, bears and wild cattle with less than four million people. They lived in small villages protected by wooden walls from the animals outside.

However, all this changed. Now Britain’s population has increased to 65 million. Three-quarters of Britain consists of fields, towns or cities. Although 25% of land is countryside，new methods of farming mean that there are fewer birds and small animals than ever before. Britain is one of the few countries in the world without a large wild carnivore(食肉动物).

Some people want to change this. Some say that Britain needs to become more natural again and suggest trees and plants that once grew in Britain should be allowed to grow again. They even say that large wild animals which have not lived in Britain should be helped to return and live wild. They call this “rewilding”.

Not everyone agrees. In the last twenty years, over one million trees have been planted and there are plans for more—but wild animals? Some people ask if wolves will attack sheep or even humans. They are also angry that rewilding might mean an end to walking in the hills many people enjoy. So far, there are no wolves or bears in Britain’s forests—but soon there might be!