They’ve retrieved a science experiment on the Japanese Kibo Laboratory, replaced a rate gyro assembly on the center segment of the station’s truss, and removed an ammonia tank used to help cool the station.

The accuracy and co-ordination between the astronauts while working in space is amazing. Imagine floating weightless in space for six-and-a-half-hours, while orbiting the earth at 17,000 miles an hour. Often they have to use the grappling robotic arm from the shuttle’s payload bay to latch onto a moving target. It’s a real tribute to the teamwork between the flight and ground crews.

Mission STS-131 continues with the transfer of science lab racks inside the space station.

Source: NASA TV on YouTube