I just saw this photo in @SF.'s answer It is ISS023-E-023513 STS-131 and Expedition 23. The full caption is below.

Are there really 13 people on the ISS at one time?

Is STS-131 the only shuttle mission that resulted in 13 people being inside the ISS?

I'm wondering about the load on the station from the extra number of bodies; water vapor, CO2, particulates, movement/vibrations... were any of these at all an issue? How long did this last - just enough for a photo op or did it last a while?

I wanna ask if the shuttle crew were allowed to use the facilities on the ISS or if they had to go back to the shuttle, but I'm too shy.

ISS023-E-023513 (14 April 2010) --- STS-131 and Expedition 23 crew members gather for a group portrait in the Kibo laboratory of the International Space Station while space shuttle Discovery remains docked with the station. STS-131 crew members pictured (light blue shirts) are NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Clayton Anderson, Rick Mastracchio, Dorothy Metcalf-Lindenberger, Stephanie Wilson and Japan Aerospace Exploration Agency astronaut Naoko Yamazaki, all mission specialists. Expedition 23 crew members pictured are Russian cosmonauts Oleg Kotov, commander; Mikhail Kornienko and Alexander Skvortsov; Japan Aerospace Exploration Agency astronaut Soichi Noguchi, and NASA astronauts T.J. Creamer and Tracy Caldwell Dyson, all flight engineers.

I just saw this photo in @SF.'s answer it is ISS023-E-023513 STS-131 and Expedition 23. The full caption is below.

Are there really 13 people on the ISS at one time?

Is STS-131 the only shuttle mission that resulted in 13 people being inside the ISS?

I'm wondering about the load on the station from the extra number of bodies; water vapor, CO2, particulates, movement/vibrations... were any of these at all an issue? 

How long did this last - just enough for a photo op or did it last a while?

I wanna ask if the shuttle crew were allowed to use the facilities on the ISS or if they had to go back to the shuttle, but I'm too shy.

ISS023-E-023513 (14 April 2010) --- STS-131 and Expedition 23 crew members gather for a group portrait in the Kibo laboratory of the International Space Station while space shuttle Discovery remains docked with the station.
STS-131 crew members pictured (light blue shirts) are NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Clayton Anderson, Rick Mastracchio, Dorothy Metcalf-Lindenberger, Stephanie Wilson and Japan Aerospace Exploration Agency astronaut Naoko Yamazaki, all mission specialists.
Expedition 23 crew members pictured are Russian cosmonauts Oleg Kotov, commander; Mikhail Kornienko and Alexander Skvortsov; Japan Aerospace Exploration Agency astronaut Soichi Noguchi, and NASA astronauts T.J. Creamer and Tracy Caldwell Dyson, all flight engineers.

I just saw this photo in @SF.'s answer It is ISS023-E-023513 STS-131 and Expedition 23. The full caption is below.

Are there really 13 people on the ISS at one time?

Is STS-131 the only shuttle mission that resulted in 13 people being inside the ISS?

I'm wondering about the load on the station from the extra number of bodies; water vapor, CO2, particulates, movement/vibrations... were any of these at all an issue? How long did this last - just enough for a photo op or did it last a while?

I wanna ask if the shuttle crew were allowed to use the facilities on the ISS or if they had to go back to the shuttle, but I'm too shy.

ISS023-E-023513 (14 April 2010) --- STS-131 and Expedition 23 crew members gather for a group portrait in the Kibo laboratory of the International Space Station while space shuttle Discovery remains docked with the station. STS-131 crew members pictured (light blue shirts) are NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Clayton Anderson, Rick Mastracchio, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Japan Aerospace Exploration Agency astronaut Naoko Yamazaki, all mission specialists. Expedition 23 crew members pictured are Russian cosmonauts Oleg Kotov, commander; Mikhail Kornienko and Alexander Skvortsov; Japan Aerospace Exploration Agency astronaut Soichi Noguchi, and NASA astronauts T.J. Creamer and Tracy Caldwell Dyson, all flight engineers.

I just saw this photo in @SF.'s answer It is ISS023-E-023513 STS-131 and Expedition 23. The full caption is below.

Are there really 13 people on the ISS at one time?

Is STS-131 the only shuttle mission that resulted in 13 people being inside the ISS?

I'm wondering about the load on the station from the extra number of bodies; water vapor, CO2, particulates, movement/vibrations... were any of these at all an issue? How long did this last - just enough for a photo op or did it last a while?

I wanna ask if the shuttle crew were allowed to use the facilities on the ISS or if they had to go back to the shuttle, but I'm too shy.

ISS023-E-023513 (14 April 2010) --- STS-131 and Expedition 23 crew members gather for a group portrait in the Kibo laboratory of the International Space Station while space shuttle Discovery remains docked with the station. STS-131 crew members pictured (light blue shirts) are NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Clayton Anderson, Rick Mastracchio, Dorothy Metcalf-Lindenberger, Stephanie Wilson and Japan Aerospace Exploration Agency astronaut Naoko Yamazaki, all mission specialists. Expedition 23 crew members pictured are Russian cosmonauts Oleg Kotov, commander; Mikhail Kornienko and Alexander Skvortsov; Japan Aerospace Exploration Agency astronaut Soichi Noguchi, and NASA astronauts T.J. Creamer and Tracy Caldwell Dyson, all flight engineers.

I just saw this photo in @SF.'s answer It is ISS023-E-023513 STS-131 and Expedition 23. The full caption is below.

Are there really 13 people on the ISS at one time?

Is STS-131 the only shuttle mission that resulted in 13 people being inside the ISS?

I'm wondering about the load on the station from the extra number of bodies; water vapor, CO2, particulates, movement/vibrations... were any of these at all an issue? How long did this last - just enough for a photo op or did it last a while?

Were the shuttle crew allowed to use the facilities on the ISS or did they have to go back to the shuttle?

ISS023-E-023513 (14 April 2010) --- STS-131 and Expedition 23 crew members gather for a group portrait in the Kibo laboratory of the International Space Station while space shuttle Discovery remains docked with the station. STS-131 crew members pictured (light blue shirts) are NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Clayton Anderson, Rick Mastracchio, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Japan Aerospace Exploration Agency astronaut Naoko Yamazaki, all mission specialists. Expedition 23 crew members pictured are Russian cosmonauts Oleg Kotov, commander; Mikhail Kornienko and Alexander Skvortsov; Japan Aerospace Exploration Agency astronaut Soichi Noguchi, and NASA astronauts T.J. Creamer and Tracy Caldwell Dyson, all flight engineers.

I just saw this photo in @SF.'s answer It is ISS023-E-023513 STS-131 and Expedition 23. The full caption is below.

Are there really 13 people on the ISS at one time?

Is STS-131 the only shuttle mission that resulted in 13 people being inside the ISS?

I'm wondering about the load on the station from the extra number of bodies; water vapor, CO2, particulates, movement/vibrations... were any of these at all an issue? How long did this last - just enough for a photo op or did it last a while?

I wanna ask if the shuttle crew were allowed to use the facilities on the ISS or if they had to go back to the shuttle, but I'm too shy.

ISS023-E-023513 (14 April 2010) --- STS-131 and Expedition 23 crew members gather for a group portrait in the Kibo laboratory of the International Space Station while space shuttle Discovery remains docked with the station. STS-131 crew members pictured (light blue shirts) are NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Clayton Anderson, Rick Mastracchio, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Japan Aerospace Exploration Agency astronaut Naoko Yamazaki, all mission specialists. Expedition 23 crew members pictured are Russian cosmonauts Oleg Kotov, commander; Mikhail Kornienko and Alexander Skvortsov; Japan Aerospace Exploration Agency astronaut Soichi Noguchi, and NASA astronauts T.J. Creamer and Tracy Caldwell Dyson, all flight engineers.