Hopefully, no one will try to steal your MacBook. But just in case it ever happens, you’ll want to be ready. Since MacBook Airs and Retina-equipped MacBooks don’t have lock-slots, Kensington has come up with a solution called the MicroSaver Ultrabook Laptop Keyed Lock ($50). You’ll have to blemish your laptop’s lid to use it, but for users in high-risk environments, that’s better than losing it altogether.