3 . To produce the classic clothing, blue jeans, producers rely on indigo dye (靛蓝染料), the only molecule known to provide jeans’ unique, beloved color. While indigo itself naturally comes from a plant, growing demand for blue jeans throughout the 20th century gave rise to synthetic (合成的) indigo, which is now more commonly used.

Indigo is the dye that makes jeans blue, but it doesn’t mix with water. To dye clothes, usually, chemicals are needed to make the color stick to the cloth. But in Denmark, scientists have created a new way to dye clothes using an enzyme (酶), which is a kind of protein that can cause chemical reactions, instead of harmful chemicals. This new method is better for the environment and doesn’t use poisonous stuff.

The chemical process for dyeing blue jeans has persisted for the last century. Workers are exposed to the poisonous chemicals, which also pollute the environment near factories. Waste water from those factories often ends up in waterways, decimating local ecosystems and even dyeing rivers blue.

Ditte Hededam Welner, the study’s lead researcher, says their new enzyme works really well and is strong enough for making lots of jeans without breaking down. This enzyme makes dyeing with indican, which is like indigo, much less harmful to the planet — about 92% better than the old way.

However, the new method doesn’t fix all the environmental problems of making jeans. Making a single pair of jeans uses a lot of water — enough to fill many bathtubs — from growing the cotton to putting the final touches on the jeans.

Even though the new dyeing process is better for the environment, it’s not always easy or cheap to change to it. Welner’s team isn’t sure if jeans companies will find it easy or affordable to switch to this method. It costs a little bit more — just seven cents extra per pair of jeans — to use the enzyme for dyeing. But Welner believes it’s worth it because it’s much better for the environment.

5 . National Parks in Utah

Zion National Park

It’s perfect for scenic drives and outdoor adventures. One of the park highlights is the Zion Canyons, which offers different hiking (远足) opportunities. Late spring or early fall is the best time to visit Zion National Park, since most facilities are open during this time. However, if you don’t mind cold weather, visit during the late fall and winter.

Bryce Canyon National Park

It’s home to the greatest number of hoodoos (石林) on earth, which are one of the natural wonders of the world. You can see most of Bryce Canyon’s highlights in one day by taking the scenic drive and making stops at various views. Most people visit the park between May and September since the weather is warmer.

Canyonlands National Park

Although it’s the 23rd largest National Park in the US, Canyonlands is the largest out of the four national parks in Utah. The best time of the year to visit is when the weather is pleasant in the spring and fall. The park has four main parts: The Maze, Island in the Sky, The Needles, and Horseshoe Canyon. If you plan to visit every part, you can go on a boat tour to explore it.

Arches National Park

Known as a red-rock wonderland, Arches National Park is popular for its stone arches (石拱).The park has over 2,000 stone arches, with Landscape Arch the largest. The park is busiest from March through October. However, the spring and fall temperatures are the most comfortable. So, the best time to visit is April, May, September and October.

10 . Worried about your tuition? Take a look at some of the big names offering tuition assistance.

McDonald’s

Hourly employees can receive up to $2,500 in tuition assistance, and salaried workers can take up to $3,000. Both on-campus and online degree programs at schools are eligible (有资格的). You only have to be an employee for 90 days to benefit from this educational program.

Chipotle

Chipotle allows employees to use up to $5,250 in tuition assistance, regardless of part-or full-time employment status. They can use these funds at two-year, four-year or vocational/ technical schools. Additionally, Chipotle is offering to pay full tuition for students studying business or technology at some colleges.

Walmart

Under its tuition assistance plan, full time employees only have to pay $1 a day towards their college tuition, and Walmart will cover the rest. This policy does not apply to part-time employees.

Publix

For college and university enrollment (注册), employees can take up to $3,200 per calendar year and a lifetime limit of $12,800. For other types of study, employees can receive up to $1,700 per calendar year and $3,400 over a lifetime.

Home Depot

Employees are eligible on day one of employment for a variety of tuition assistance benefits. Salaried employees can receive up to $5,000, full-time hourly employees $3,000 and par-time hourly up to $1,500 per calendar year.

UPS

On the day employees are hired, UPS will provide up to $5,250 per calendar year and up to a lifetime maximum of $25,000.