1. Marathon Mouse 马拉松老鼠
With an "exercise pill," researchers turn couch-potato rodents into champion runners.
有了“锻炼药”，研究人员是一只整天坐着吃马铃薯片的老鼠变成长跑冠军。
2. Dinosaur Plague 恐龙灭绝
Insects caught in amber spark a controversial theory about what killed the dinosaurs.
琥珀中的昆虫激发了一种恐龙灭绝理论。
3. Profile: Franklin Chang-Díaz 人物
The first Latino-American astronaut is also a scientist designing a new generation of plasma-powered space vehicles.
首个拉丁美裔的航天员也是一个科学家，他设计了新一代的由等离子驱动的太空飞船。
4. Space Storms (originally aired July 16, 2008) 太空风暴
Behind the dazzling display of the aurora borealis are space storms that could turn the lights off here on Earth.
炫耀的北极光背后是太空风暴，它能使地球变成漆黑一片。
