Amber and I are watching Modern Marvels on the Mackinac Bridge in Michigan. (The C is silent – Mack-in-aw.) Stuff like this amazes me – the sheer size and amount of materials required for a project this big are hard to comprehend. To help combat the crazy winds the bridge can be subjected to, the center two lanes are actually metal grates. It can flex as much as 35 feet to the left or right and 10 feet up and down. It’s something like 150 feet from the road surface to the water below. My mom had trouble driving up and down Pike’s Peak and over Skyline Drive in Colorado. There’s no way she could make it over this bridge on her own when you can see right through it.