There's a good chance that something you've bought online has been in the hands of a " picker". These are the workers in warehouses (仓库) who pick, pack and ship all those things we ordered.

At Amazon and other companies, they're working side by side with robots. Experts say while the robots are replacing some human workers, the machines aren't quite ready to take over completely.

When a robot finds its storage unit,' it slides underneath, lifts it up and then delivers it to a worker they're called pickers. On a recent day, the computer told a picker to grab what looked like a fantasy board （#t 3#)game. The picker found it, packed it and placed it on the conveyer belt.

"In a traditional fulfillment center where the workers would walk to the different items, it can take hours to fulfill a customer order," Robinson says.

Now, with the help of robots, that task takes minutes and fewer humans.

So is this a sign that we're entering a new industrial revolution?

" It's definitely going to take over a lot of jobs ", says Karen Myers, a scientist at SRI, one of Silicon V alley's oldest research centers.

At the same time, she says, " We're running against the limits of technology. " Take the picker at the Amazon fulfillment center for example. Myers says those skills prove to be uniquely human.

"Our fingers are incredibly flexible and the current generation of robotic operators are getting much, much better," she says. "But they're just not quite there yet."

There's also the robot's brain.

Remember that board game the Amazon worker was looking for? She could barely see the box when it was filled into the storage bin——but she could tell it was a board game. Robots can't do that.

Technologists say that, increasingly, humans will work side by side with robots——instead of robots working alone.

Amazon says robots and humans enabled the Tracy warehouse to fulfill customer orders faster. That means more customers and more human workers.

   A total of 17 paintings worth between 10 and 15 million euros were stolen at a museum in northern Italy, local officials said on Friday.

Three armed men with masked faces broke into the Castelvecchio Museum in Verona on Thursday night, a local newspaper reported. Located inside a castle which was built in 1354 ,the Castelvecchio Museum is one of the most important museums in the northern city.

The stolen paintings included masterworks from Andrea Mantegna, Jacopo Tintoretto, Peter Paul Rubens, Jacopo Bellini, Hans de Jode and other world-famous artists. The group controlled the only private security guard who was there and the cashier, and then forced the guard to accompany them to the rooms where they stole the paintings.

Verona Mayor Flavio Tosi, who stayed at the scene until late in the night, said that surely someone sent them, because they acted professionally, and knew what they were looking for. The paintings stolen, he added, basically  were the most valuable works on display. An investigation was opened into the theft.

The museum displays a very important collection of Italian and European art in 29 rooms including early Christian finds, Lombard gold work, sculptures from the 10th to the 14th century, medieval arms  and armor, and paintings from the 14th to the 18th century.

The museumi's director, Paola Marini, called herself shocked by the theft. The experienced art historian, who is about to leave her post after over 20years, was receiving an award in a nearby restaurant when she was informed of what had happened.

The theft came just a day after two stolen paintings recently recovered by Italian heritage police were displayed in Rome during a ceremony attended by President Sergio Mattarella and Culture Minister Dario Franceschini.

How teens can stay fit

Any type of regular physical activity can improve your fitness and your health.【小题1】

Exercise should be a regular part of your day, like brushing your teeth, eating and sleeping. It can be in a gym class, joining a sports team, or working out on your own. Keep the following tips in mind:

【小题2】A good attitude is important. Find an activity that you think is fun. You are more likely to stick with it if you choose something you like. A lot of people find it's more fun to exercise with someone else,so seek a friend or family member to be active with you.

Take it one step at a time.【小题3】For example, walk or ride your bike to school. Get on or off the bus several blocks away and walk the rest of the way. Use the stairs instead of taking the elevator.

Get your heart pumping. Whatever you choose ,make sure it includes aerobic （有氧的) activities that make you breathe harder and increase your heart rate. This is the best type of exercise because it increases your fitness level and makes your heart work better.【小题4】Examples of aerobic activities are basketball, running, or swimming.

Don't forget to warm up. Do  some  easy exercise or stretch （伸展) before you do any physical activity.【小题5】It is also important to stretch out after you exercise to cool down your muscles.