Josepha Sherman

Clouds come in all sorts of types, including cumulus, cumulonimbus, stratus, and cirrus. Learn how to tell each cloud type apart.

While investigating rain, learn about the water cycle and problems with rain, including droughts and floods.

Find out about the different types of winds, including global winds, trade winds, local winds, and breezes. Learn about extreme wind weather like hurricanes and tornadoes.

2329: Now a diplomat for the United Federation of Planets, Spock agrees to a bonding with Commander Saavik. More than a betrothal, less than a wedding, the sacred Vulcan rite is attended by both Spock's father, Sarek, and a nervous young Starfleet lieutenant named Jean-Luc Picard. 2344: Ambassador Spock receives a top-secret communication from the heart of the Romulan Empire. Decades before, Spock had met and betrayed an honorable Romulan commander...

Introduces the history, uses, production, advantages and disadvantages, and future of nuclear energy as a power resource.

A clever and beautiful woman uses her wits to get her husband out of Prince Vladimir's prison.

Introduces the history, uses, production, advantages and disadvantages, and future of fossil fuel energy as a power resource.