As a language learning enthusiast, I’ve come up with the best apps for learning English from the thousands of mobile apps out there.

Best for Pronunciation: ELSA Speak

ELSA Speak is probably the best mobile app around for helping you improve your English pronunciation. The app’s greatest strength is its intensive AI feedback, but ELSA also provides mini-training sessions to really perfect your pronunciation. The AI analyzes your recordings based on pronunciation, intonation and fluency then points out exactly which parts sound inaccurate.

Best for Immersing in English Videos: FluentU

FuentU is a language learning app that teaches you English through authentic videos like news reports, movie scenes and interviews, with learner tools for all levels. Each clip has interactive subtitles so if you’re not sure what a word means, you can hover over it and get in explanation. The app also gives video examples for each word so you can learn vocabulary in context.

Best for Practical Topics: Babbel

Babbel has you learn and practice English with realistic conversations that surround things that you’re personally interested in. Lessons are short and consist of written and audio versions of the grammar featured in the lessons. Then you are able to complete practice exercises to solidify your understanding.

Best for Fun Beginner Lessons: Lingodeer

Lingodeer uses games and short exercises to teach beginner and intermediate English learners. Lingodeer takes a gamified approach to language learning with a goal-oriented curriculum consisting of structured lessons and regular reviews. Lingodeer’s lessons are arranged according to themes, such as sports, weather, parts of the body and shopping.

I have lived in rural America for nine years, first in Michigan, where I got my PhD; then in central Illinois and now in Indiana, where I am a professor. In a place where most people have lived the whole of their lives, I feel like a stranger. There are few things I enjoy more than complaining about my geographic isolation. I’m a vegetarian, so there’s nowhere to go for a nice dinner that isn’t 50 miles away. I’m black, so there’s nowhere to get my hair done that doesn’t involve another 50-mile drive. And the closest major airport is two hours away.

I recite these gripes to my friends. We all have grand ideas about what life would be like if only we did that, or lived there. And there’s this; I really don’t intend to change most of the things I complain about. Griping is seductive on those days when happiness requires too much energy. But it also makes me lose sight of the fact that I was born and grew up in Nebraska and have lived most of my life in one of the plains states. When I go to the coasts, I am struck by how unappealing big-city living can be.

While I may not love where I live, there are plenty of people who are proud to call this place home. At a party with colleagues, I was going on about everything I couldn’t stand in our town when I noticed that they were silent and shifting uncomfortably. That moment forced a change in me. Complaining may offer relief, but so does acceptance. There is no perfect life. By focusing on gripes, I risk missing out on precious moments of appreciation. When I get home, I stand on my balcony, look into the night sky and see the stars. I know that I have absolutely nothing to complain about.

The human brain is the most complex and poorly understood biological structure known to man. Our human brain is relatively large for our body size and wrinkled in comparison to other animals’ brains. Across species, brain size and wrinkle number is related to intelligence.

University of Copenhagen researchers have made an incredible discovery seeking to learn more about the mammalian (哺乳动物的) brain. A vital enzyme, a special material, allows brain signals to be transmitted or transported. The enzyme is randomly turning on and off, even taking hours-long “breaks from work.” These discoveries could have a significant impact on our understanding of the brain and the development of medicines. The discovery is featured on the cover of Nature.

Millions of neurons (神经元) are constantly communicating with one another, shaping thoughts and memories and allowing us to move our bodies at will. Neurotransmitters are transported from one neuron to another by a unique enzyme when two neurons meet to exchange a message.

This process is necessary for neuronal communication as well as the survival of all complex organisms (extremely small living things). Until now, researchers all over the world assumed that these enzymes were constantly active, transmitting vital signals. However, this is not the case.

It is almost impossible to understand that the extremely critical process of loading neurotransmitters in containers is carried out by only one cell per container. Especially when we find that 40% of the time these cells are switched off.

Using a new method, researchers from the Department of Chemistry at the University of Copenhagen closely examined the enzyme and discovered that its activity switches on and off at random periods of time, contradicting our previous understanding.

“Contrary to popular belief, and unlike many other proteins, these enzymes could stop working for minutes to hours. Still, the brains of humans and other mammals are miraculously able to function,” says Professor Dimitrios Stamou, who led the study from the research center at the University of Copenhagen’s Department of Chemistry.