Ever wondered about why we, as a race, can act like such complete assholes to people we don't know? It's all about the monkeysphere.
Ever wanted an invisibility cloak, or a cloaking device? Now you can have one... just so long as whatever you want to make invisible is the size of a single wavelength of light, and you only need to make it invisible in monochromatic light.
Thankfulness? Sure, for unexpected words of appreciation when you really, really need them. Compensated for by frustrations including having to decline an interview for a job because it paid so little I could not have stayed at it anyway, because I couldn't possibly have supported cymrullewes and the girls on it in the Bay Area.