Build an astrolabe out of household materials! In the 1600s and 1700s, sailors used the astrolabe to determine their latitude in the sea by measuring the attitude of the Sun or another star. (From the UC-Berkeley "At Home Astronomy" site.)
DIY: archivadores de cartón forrados de papel
These homemade ecosystems are simple to put together and are so neat! Such a cool way for kids to learn!
Plant cell 3D model for 7th grade science class. Got an A!
A science fair experiment is generally a competition where contestants present their science project results in the form of a report, display board, and models that they have created. Description from pixgood.com. I searched for this on bing.com/images