A Russian-built Progress spacecraft lifted off from the Baikonur cosmodrome today atop a Soyuz booster. Mission 13P is carrying a full load of supplies and scientific equipment and will reach the International Space Station within two days. The spaceship will deliver two dummies designed to measure the long-term effects of space radiation on the human body; one will be attached to the outside of the station to get a direct exposure. The station's previous Progress ship was detached on Wednesday to make room.