PBS
Pbs Nova: Science Now: Mass Extinction
A video narrated by Neil deGrasse Tyson that explores what caused the Permian extinction, the mother of all extinctions, 250 million years ago? [13:14]
PBS
Pbs Learning Media: Desert Biome
This video segment from NOVA: "A Desert Place" describes the physical characteristics and organisms that define the desert biome, and how living things adapt to this environment. [4:58] Includes background reading material and discussion...
PBS
Pbs: Nova Labs: Growing Appetites, Limited Resources
Humans' access to energy resources has often meant the difference between illness and health, poverty and wealth, and illiteracy and education. Learn more with this short overview. A transcript is provided as well. [2:21]