tom swift among the diamond makers

 Okay, condensation is not much to talk about but it is a pretty interesting affair. So this girl is putting up posters because she is running for school president and it is a glass board. And it was really cold out n that day so then they go to bed and in the morning when they come back all the posters were all wet. And stuff because of the cold the water had condensed on the glass and marked the ink on the paper. Just like when you have a cold bottle of water you get condensation on the outside. I am pretty sure this happens when the air inside is colder than the air outside.