qjkxbmwvz
Interesting that 1) donating blood uses a red spot, and 2) the colors don’t change continuously (there are blue-orange jumps skipping yellow, and yellow-red jumps skipping blue).
I have an old (probably '60s) hifi amp. It’s awesome. Replaced the selenium rectifier with silicon, replaced a few caps, and put fresh tubes in it.
It sounds…basically the same as modern solid state stuff to my untrained ear. It’s pretty cool that in a sense we “solved” the problem of amplification back then. Most of the speakers of the day were probably complete crap by today’s standards (unless you had something upscale like a pair of AR-3s), but a well designed amplifier from the era holds up well.
Kids these days can still enjoy the finer things in life.
I have a Mikrotik router, 2x VLAN-enabled switches, and 3x VLAN-enabled APs. My Internet access broke every day for a month while I figured out what I was doing.
VNC over ssh or wireguard when remote graphics are required. Not as “polished,” but it’s nice not depending on a 3rd party.
Super cool. Chemical fuels (hydrocarbons or even plant oils) have ridiculous energy density, which is nice for e.g. cars but absolutely crucial for fast, long-range air travel. I don’t think we’ll be saying goodbye to jet engines for a long time, and it’s awesome that we have ways of making fuel in a somewhat sustainable fashion.
The US Navy has experimented with this, but I think the idea is to use nuclear power instead of solar energy. Makes sense for an aircraft carrier with a big reactor and thirsty jets.