Yale College, the undergraduate school, is the heart of the University. It's been

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?
(这是科学美国60秒节目，我是Steve Mirsky.，欢迎收听。)

On June 4th we told you about iron snowflakes雪花 on Mercury水银. （6月4日我们向你介绍了？）