Astronauts tested glassmaking techniques and studied the confused behavior of tadpoles hatched in space Tuesday.
Chemist Mamoru Mohri, Japan's first professional astronaut, attempted to forge glass in a high-tech furnace that suspends the ingredients with sound waves.
The technique allows the production of ultra-pure materials. Glass made in such a furnace has potential applications in fiber-optic communication technology.
Scientists at a control center in Huntsville, Ala., crouched around a television monitor early Tuesday as Dr. Mae Jemison beamed down pictures of 2-day-old tadpoles. The amphibians darted around and swam in circles, activity that differs from their behavior on Earth.