Last year I moved to the countryside, to a neighbourhood full of young families. 【小题1】 Without anyone really noticing, smart doorbells have quietly become very popular.

Perhaps I shouldn’t be surprised. For somewhere between $30 and $200, you can make sure that you never miss a delivery again. Whether you’re in the garden or on the other side of the world, if someone rings your bell, you’ll know who’s calling because of the built-in camera. And if you can’t get to the door, you can even talk back to them using your phone. 【小题2】 They may be people who don’t work from home, people who can’t walk easily, or people like me, who are lazy.

However, actually making certain which doorbell to buy is difficult as there are many different types to choose from. So how should you choose which one will work best for your home?

【小题3】 Some doorbells have a wider field of view than others, meaning the camera will see more. One increasingly common feature (特征) on doorbells is a second camera that points down towards the ground to see any packages that have been dropped outside your door.

But in my view, the most important part when picking a smart doorbell is safety. 【小题4】 That is because a smart doorbell is to protect your home, but considering your doorbell camera will be recording exactly when you enter and leave your own home, it’s important to make sure your data (资料) is kept safe.

And finally, the big question: Which brand (品牌) should you go for? Considering the state of the market, I’d recommend choosing a big name you have heard of. Because while you might pay a little more than others, it will make you safer. 【小题5】

Clearly, having a positive attitude is pleasing. 【小题1】 However, by taking some of the following tips, you can keep a positive attitude.

There's so much for which to be grateful in life. Why not remind yourself of that on a daily basis? Once a day, you can write down at least three things that you feel thankful for. 【小题2】 All that matters is that you're remembering to feel grateful every day.

【小题3】

It's easier to keep a positive attitude all day if you start it right when you open your eyes. Think about some ways to make your morning the best part of your day. Consider waking up half an hour or even an hour earlier than usual，and start your morning doing something you love.

【小题4】 Laughter can produce neuropeptides (神经肽), which fight stress and other serious illnesses. By cracking more jokes, you can make humor out of negative situations at work, and meanwhile prepare your body and mind for a more positive outlook.

Having something planned after a long day of work can make the day look a little brighter. Your plans don't always have to include going out for drinks or dinner. Even planning a wine night with friends will be okay.【小题5】

Traffic jams are the horrible dreams of motorists’ lives. If you think your journey is bad, spare a thought for drivers in Sao Paolo, Brazil — one evening in May last year, the traffic jams during the rush hour added up to a 344km queue, according to the city's traffic management agency.

This isn't a new problem, of course. During the car boom of the 1960s, city planners had one seemingly obvious solution: build more and wider roads. But the more roads created, the more cars they attracted. So what's the solution? Some cities have adopted easy methods, like banning cars from driving on certain days.

However, ending this horrible dream may need more of a complete rethink. A company, Urban Engines, has a slightly fresher method. "We're providing an online game that offers trip suggestions and prizes to encourage commuter behaviour changes, including changing travel from peak to off-peak times,“ says Shiva Shivakumar, Urban Engines' co-founder and GEO. For the past two-and-a-half years, the company has conducted pilot studies in major cities, including Bangalore and Singapore. In Bangalore, one-in-six people who took part in the trial started travelling off-peak, and in Singapore one-in-eight.

But others think this solution doesn't go far enough—and that we should provide more reasons for putting fewer cars on the road. “The only effective long-term solution is to improve alternative methods—walking, cycling and particularly high-quality public transport,” says Todd Litman of the Victoria Transport Policy Institute in Canada. Road pricing that charges motorists extra if they drive during the rush hour could also be an option. Cities like Singapore, London and Stockholm have successfully used road pricing to control the steel river.

The solution to beating traffic jams in cities, if it comes, will probably take a long time to gain prizes. But if at least some of these new ideas are a success, the days of Sao Paolo's heavy traffic jams may finally become history.