Disregarding the grammatical discussion in the comments on that question1, Rashi (a commentary on Bible) wrote that if you hollow out an eggshell, fill it with dew, close it, and leave it out in the sun, the eggshell will rise in the air.
Question: will an eggshell, filled with dew and heated, actually rise in the air?
Apparently, someone tried this out, and found that the eggshell rose a few centimeters. (Page is in Hebrew, Google Translate does an OK job, but everything you really need to know is copied here.)
Also found this type type of thing discussed (though with a different starting point) here.
1 FTR, I actually think that he was referring to the dew, but let's look at this question as if he was talking about the eggshell.