Introduces the clock and the history of telling time, from sundials and water clocks to the extremely accurate atomic clocks of today.
精彩科學技術史-艱難的啟蒙
精彩科學技術史-科學精神的覺醒
High-tech DIY proj ...
精彩科學技術史-在黑暗中探索
精彩科學技術史-工業化浪潮
The airplane
The submarine
The radio
The television
Solar power
The printing press
Nuclear energy
Inventions we use ...
Because of Winn-Dixie (Classroom Set)
The lunch line (Classroom Set)
The magic finger [Classroom set]
Wake me in Spring (Classroom Set)
Horrible Harry and the green slime (Classroom set)
What is that (Classroom Set)
A mouse told his mother (Classroom Set)
Sharing time troubles (Classroom Set)
Here comes the snow (Classroom Set)
Voyage To The Volcano (Classroom set) : The Magic School Bus: A Science Chapter Book
Simple Machines[Classroom set]
My dog's the best (Classroom Set)
Soccer cousins(Classroom Set)
Five little ducks : an old rhyme (Classroom Set)
The ball game (Classroom Set)
The chocolate touch [Classroom Set]
The fattest, tallest, biggest snowman ever (Classroom Set)
Football Friends (Classroom Set)
Wild weather--Hurricanes! (Classroom Set)
The Stubborn Pumpkin (Classroom Set)