It's funny for you, isn't it? Twenty years ago, in the last months of her life, my mother campaigned to draw attention to the horrific and indiscriminate impact of landmines. She visited affected area
Remarks by the president at the lighting of the nationality christmas tree 2013年 美国总统奥巴马在“国家圣诞树”亮灯仪式上的讲话 Merry Christmas, everybody! Well, this show is always a great way to get in the hol
Mother trees colonize their kin with bigger mycorrhizal networks. 母树通过更大的菌根网络来覆盖住自己孩子们所在的区域。 They send them more carbon below ground. 在地下，它们给孩子们会送去更多的碳。 They even reduce their own root competition to
Hi everybody. Today, I'm at Del Sol High School, in Las Vegas, to talk with students and families about immigration. 大家好！今天，我来到了拉斯维加斯的德素高中，与这里的同学和家长们谈论移民问题。 We are a nation of immigrants. It has a
