Refinar

Kids use simple machines every day without realizing it. Teeth are wedges and so are knives, forks, and thumbtacks. Slides, which are inclined planes, and seesaws, which are levers, are also simple ma...

No mystery is too great for super-sleuth Cam Jansen and her amazing photographic memory! Mysteries follow super-sleuth Cam Jansen everywhere she goes...even to the museum. Cam and her class are on a f...

A brief biography of the woman who overcame her handicaps of being both blind and deaf.

A basic introduction to the concept of fractions features hands-on activities.

It can be surprising which objects float and which don´t. An apple floats, but a ball of aluminum foil does not. If that same ball of foil is shaped into a boat, it floats! Why? And how is it possible...