give it a day or two (we did two days) and see what happens!
When we pulled ours out, it was still very much intact, seemed MUCH more fragile and looked a little baggy, shrunken and raisin-like.
How did this happen???
Well, corn syrup has very little water content, so the water inside the egg begins to move across the semi-permeable egg membrane to equalize the water concentration. Again, that’s osmosis at work. You could leave your egg inside the corn syrup until it shriveled up to look just like a big raisin with the yolk inside.
(side note: As I've watched the video a couple of times now, it occurred to me that I have one very interested son...he made it up to the front of the crowd and was DETERMINED to save the egg from impending doom...only to be told to stop many times...lesson to me (as Mom and Teacher) ~ some kids just feel things so much more intensely than others, embrace it and love it...they are special and unique and I am lucky enough to be his Momma!)
Here's a way to look at it, that'll be helpful for you.
A hypertonic solution is a solution that has lots of stuff in it. What happens when you have lots of stuff in the water? Well you're going to have LESS water. Right? A hypotonic solution is a solution that has less stuff in it. When there's less stuff in it, there's going to be a lot more water.
In nature everything needs to be balanced, something called equilibrium. Whenever you place a cell in a solution that is hypertonic (lots of stuff in it), the solution is obviously going to have less water than the cell. So what happens is the cell's water flows outwards into the solution to balance out. Because all the water flows out of the cell, the cell has little water left and so it shrinks in size. Another way to think of it is the water went from an area of high concentration (the cell) to an area of low concentration (the surrounding solution).
If you place the same cell in a hypotonic solution (a solution that has less stuff and more water), the cell will then have more stuff in it than the surrounding solution. Because the cell has more stuff in it, that means the water in it is less than the surrounding solution. In other words, the amount of water in the solution is higher than the cell. So the water flows INTO the cell, causing it to swell up. Another way to think of it is the water went from an area of high concentration (the surrounding solution) to an area of low concentration (the cell).