That airy beam thing was cool. and the tall optic fiber making machine, and pretty much everything they showed us. Using that water was pretty cool...and the whole joke about trying to send a message to California with a laser beam, but it'd hit the wall, but you could use water, but it would get distorted, so on. It was pretty cool and funny. However I just went on a [more boring] Arboretum tour, and I was kinda tired at that point.