It can be expensive to do science experiments. Physics Gizmo allows you to collect science data at school, home, or even in space using only your Android phone.
1) Select your sensor
2) Give your data a name or leave it with the time and date.
3) Set the timer.
4) Click start to collect data.
5) Upload your data to analyze later.
More details can be found at http://www.brokenairplane.com/2011/10/android-education-science-physicsgizmo.html
My goal is for this app to enable more students around the world to do science!