Sadly, laptop thefts occur in the library every quarter.
It may be really crowded, but the honest people studying around you are concentrating on their work not your laptop.
Don't be a victim of laptop theft.
Here is what you can do to protect yourself from laptop theft.
Record and store (somewhere other than your laptops) your laptop's serial number.
Windows doesn't make this easy outside the command line. Best to just find it on the machine and write it down.