Interesting Stuff

So, last night it was just starting to rain when I walked back from the tourguide meeting. The kind of rain where you can still watch individual raindrops hit the pavement. However, I noticed something really strange – In the midde of the slabs of concrete that make up the sidewalk, the rain was absorbed into the concrete (it’s apparently quite porous), and so the concrete continued to appear dry for several minutes. However, Within about half a foot from any crack in the sidewalk, the rain stayed on the surface and made it look wet. It appeared as though it was only raining on the cracks! I for one thought this was pretty neat. My dad hypothesizes that they put some kind of sealant around the cracks to keep rain/bugs/plants out of them. I don’t know, but it’s pretty cool.