more panicking about missed connections: your rental car is ready when you are. your journey will be stress-free as long as you remember to keep an ear on local traffic news, and leave plenty of time to reach the airport. glow stick will slow down the reaction taking place inside - it may even almost stop the process so you can place them in the freezer for one week and when they de-frost they will start to glow again.
how do glow sticks glow? that's how! 