City Ticket for weekend travel on Metro-North

If you’re traveling on Metro-North Railroad within New York City on weekend, you can get a city Ticket.

Price .

City Tickets cost $4. 50 and are good for one-way travel that begins and ends within New York City as long as riders continue their trips in the same direction. On Metro-North, you can use a City Ticket for trip

Harlem line trains between the Bronx and Manhattan.

How to buy a City Ticket

You can buy a City Ticket at a ticket office, a ticket machine, or on the eTix app on your phone. Not stations have ticket windows open on weekends, but all stations have ticket machines. You cannot buy a City Ticket onboard a train.

• City Tickets are available starting at 12 : 01 a. m. on Saturday through 11^:59 p. m. on Sunday.

• They must be used on the day of purchase (购买).

• You have an extra period that allows you to travel until 4 a. m. on Sunday or Monday morning for tickets purchased on Saturdays or Sundays, respectively (分别地).

City Ticket limitations

You can't use a City Ticket :

• For travel to or from Belmont Park station which is only open during special events, or the Far Rockaway Station because these trips travel through Nassau County.

• On New Haven Line trains between Manhattan and Fordham Station.

• City Ticket can be used for direct travel only. You cannot change direction at junction points.

• $10 is required for per refund (退票).

Grace Murray was born in New York City in 1906. She liked working out how things worked. When she was 7, she took apart her alarm clock. All the parts flew out of the clock, but she couldn’t make sense of the mechanism. Instead of giving up, she dismantled all the other alarm clocks in the house, determined to discover how they worked.

Grace's parents encouraged her curiosity. They took her to museums, libraries, concerts, and lectures. When Grace was 8, her father became ill and had to have both legs cut off. He never complained. His bravery inspire Grace to face challenges head-on. If her father could be so brave, Grace felt that she could conquer anything.

Grace's father worried that he might not always be able to provide for his daughters. He wanted them to get a good education and be able to support themselves. He encouraged them to go to college and create their better future. Grace started at Vassar College when she was 17, She studied math and physics. Then she went to graduate school at Yale. With a PhD in mathematics, the little girl who'd spent her days dealing with clocks Would become one of the greatest computer minds of her generation.

After graduating from Yale, Grace joined the U. S. Naval Reserve(海军预备役), where she worked on the first large automatic(自动的)calculator in the U. S. Her team came up with new ways to interact with computer data. Grace believed the data should be similar to human language. Later, she helped develop a computer language called COBOL, which uses English words.

Grace’s was as a pioneer in computer science. At a time when women were rarely seen in STEM ( Science, Technology, Engineering and Mathematics) fields, she worked with other experts to develop computer programming as it's known today.

As climate change affects the planet, the world is turning to seaweed (海草)as a possible settlement and play a huge role in fighting climate change. It is used to create natural fuel and renewable plastics. It helps improve oceanic ecosystems.

People think of forests as the best defense(防护)against climate change. But some researchers say seaweed is a better settlement. Unlike trees, seaweed doesn't need fertilizers or fresh water. It grows faster than trees do. And it doesn't require any land. Most importantly, it absorbs carbon from the environment.

Seaweed could also become a key global food source. Many worry about the environmental influence of eating meat. Could seaweed farms provide enough protein for the world? Carlos Duarte, a professor of oceanic ecology thinks so. When you look at how we are going to feed the world population by 2050, in a way that doesn't harm the environment, there is only one pathway," he says. "Seaweed fanning."

In the past decade or so, global seaweed production has doubled. In British Columbia, seaweed farming becoming popular. For thousands of years, First Nations people, the native people of Canada, have farmed on land and in the ocean. Seaweed farming helps them create economies of their own that agree with their traditions. Their role has always been to connect with the land and repair it.

Seaweed might fight climate change but it isn't without risks. If it isn't harvested, it can go bad and give off carbon back into the air or water. Growing too much of it could also affect the amount of light that reaches species living deeper in the water. That would be dangerous for underwater ecosystems. So some scientists think seaweed can be a part of the settlement to climate change, but it's not a perfect one on its own.

Caleb Arnold loves birds-especially hummingbirds. The 7-year-old boy knows a lot about his favorite animal. "They pollinate(授粉)plants, and they' re pretty and small," he says. But there's one thing Caleb didn't know: hummingbirds see a wider range(范围)of colors than we do.

It makes sense that Caleb didn't know this. Few people did for sure, until June 15,2020, when researchers published a report in Proceedings of the National Academy of Sciences. It confirmed the fact that scientists have long suspected. Birds are experiencing a more colorful world that is above our own. A team of scientists conducted a three-year experiment to find out if hummingbirds are able to tell apart colors that look the same to humans.

To understand the experiment, it¹ s important to know how color vision works. There are three types of tiny color-sensitive cones(锥细胞)in the human eye. Birds, and some other animals, have a fourth. This means they can also see ultraviolet (紫外线)colors. The ultraviolet cone type allows birds to see combination colons that humans can't, like ultraviolet green and ultraviolet red. Biologists studying birds have supposed that birds can see these, but it's been challenging to test this idea.

That's exactly what the team did. They put two bird feeders in the wild. One contained ordinary water. The other contained sugar water. Both feeders held a specially designed LED light stick—sort of a bird-vision light tube-that changed colors. If we are showed the ultraviolet green tube and the green tube, they'd bog just look. green to us. But the hummingbirds saw the difference. They could even tell apart two shades of ultraviolet red. The scientists observed that the birds were able to use the colors of the lights to find the sweet water

Caleb is glad scientists want to better understand birds. Good. is “Good" he said, after hearing the news, "They part of nature.”