Is a picture worth a thousand words? We think so! Take a digital (数码的) photograph that answers this question: Why is Earth Day important to our planet?

The winning photographer will receive a digital camera, and the photo will be published in TIME for Kids magazine. Get details below.

●The competition is open to students from 8 to 13 years of age.

●Judges will look for originality (原创性), creativity, photo composition (构图) and relation to the Earth Day theme.

●Students must include their first name only; their e-mail address; a parent’s or a teacher’s e-mail address(very important), a caption (说明文字); the location in the photo; and the date when it was taken (must be between June 1, 2018, and December 20, 2019).

●Competition begins: October 9, 2019

●Competition closes: December 20, 2019

●To enter, students should visit timeforkids.com/2019earthdaycontest and follow instructions to provide an original digital photo.

●The winner will receive a digital camera.

●All entries must follow the official rules for consideration.

To help our readers find the best bike share programs in their area, we reviewed platforms that are local and have options in a few large markets. Here are our top picks.

The Vitality Big Half gets underway this morning. It was first launched last year and saw 11 ,000 take part, with the aim of bringing Londoners together and celebrating the diversity of the capital. A festival is being held at the finish line with music, food and activities throughout the day.

The strong winds this morning unfortunately mean that the scheduled music performances from local talents have had to be cancelled as it's impossible to build the temporary stage structures for the festival. The food will still be available and the event will include cooking classes from MasterChef Steve Kielty, and there will also be running challenges, trampolining（蹦床运动）, craft making and gardening advice.

When the half marathon starts:

The Vitality Big Half will start from 9 am by Tower Bridge, as well as The New Balance Big Relay.

The 2.4-mile Little Half will start at 12: 45 from Southwark Park, while The Vitality Big Mile will start at Greenwich Park from 12: 30.

Greenwich Park will also be where The Vitality Big Festival is held between 9 am and 4 pm today.

What is the route:

The Big Half will be starting at Tower Bridge and runners will then follow a 13.1-mile route that will take them past Shadwell and Limehouse, before circling around Canary Wharf.

Half marathon runners will then follow up the River Thames back towards Wapping and then go over Tower Bridge and head towards Southwark Park.

The route continues along the south side of the River Thames and circles around Rotherhithe before joining the Little Half runners and travelling through Deptford towards the finish line at Cutty Sark.

How to watch the runners:

You can go to various points along the route to watch the runners in person, watch them at home on your TV or watch them online.