Re: We're not advanced enough to understand "aliens".
“Any sufficiently advanced technology is indistinguishable from magic”
Any sufficiently advanced technology is locked up in the SW corner of Area 51 at a place called S-4. Or underneath Wright Patterson AFB or Site-D, if you believe in that sort of thing.
Bob Lazar was on YouTube recently showing how he powers his hydrogen fueled car by using the particle accelerator he built himself. Worth a watch.