This website from the Children's Discovery Museum (CDM) in San Jose, California, offers a variety of interactive tools and games for children ages 4 to 10 years. The mathematics game featured is a card game called Arithmetic Rummy and requires a printer, while other features are more graphic-oriented. For example, an interactive video takes children through a short journey about energy, while another highlights water ways. The Teacher section provides additional tools and resources, which can be searched by grade level and then topic area. These lesson ideas can be used both on and off the Internet. Parents and teachers can also learn about other programs at the museum from this website. Registration is not required, but parents and educators are encouraged to register so CDM can "offer more personal experiences on the site for each child registrant" and "communicate appropriate educational content directly."