Presents a science activity in which students simulate increases and decreases in frog populations to get a better understanding of different environmental issues affecting animal populations. Includes simulations for both natural frog populations as well as populations affected by human activities. (YDS)

Presents a long-term investigation designed to provide practice for students in thinking in a scientific manner about a real problem--the impact that waste products may have on soil. Focuses on student questions that have some connection to the local community. (JRH)

Outlines a class project in which students explore characteristics of paper towels and paper towel advertising. Students design a variety of experiments related to paper towels and their claims. Provides four activities. (DDR)

Enables students to examine the time course for seed imbibition and the pressure generated by imbibing seeds. Provides background information, detailed procedures, and ideas for further investigation. (DDR)

Describes an extended problem-solving activity utilizing drift-bottles that encourages students to deduce probable and great-circle drift-bottle routes, to use logic based on unit calculations, and to estimate the distance traveled and the minimum velocity of these drift-bottles. Includes materials needed, learning objectives, procedures,…

Describes the construction of durable, inexpensive and large sand-hourglasses for use in controlled experiments that allow students to observe, infer, measure, record data, and predict. This hands-on activity is designed to take place over a three-day interval. Includes materials needed, techniques, procedures, follow-up activities, and resource…

Provides examples of using real time data sources from the Internet and the World Wide Web to enable students to collect the data that leads scientists to scientific paradigms, expand the scope of instruction to regional and global perspectives, and integrate science with other curriculum areas. (DDR)