研究：小行星撞击在月球上形成了两条“大峡谷” A new study suggests an asteroid strike on the moon billions of years ago left two huge valleys about the size of Earth’s Grand Canyon.

什么是超级碗？ This Sunday, February 9, is not a holiday in the United States, but it might seem like one to Americans.

迈阿密悖论博物馆旨在欺骗你的眼睛 Paradox Museum Miami is a mixture of art, science, and fun.

描述人工智能的重要术语和概念 There are several terms experts use to describe computer systems in the field of artificial intelligence.

美国地名——宾夕法尼亚州葛底斯堡 The Gettysburg National Military Park is in the small town of Gettysburg in the eastern state of Pennsylvania.

帝王蝶数量接近30年来最低点 An American nonprofit group says the number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in nearly 30 years.

美国发明：电视 Television has made it possible for people around the world to share in many different experiences – sports, music shows, films, and more.

方案 This week on Ask a Teacher, we answer a question from Marco in Italy.

尼泊尔提高攀登珠穆朗玛峰的许可证费用 The government of Nepal has increased the cost of a permit to climb Mount Everest by about one-third.

准备蔬菜最健康的方法是什么？ Carlene Thomas is a dietitian, a person who gives advice about healthy foods to eat.