3 ms·
Wow I was skeptical before I clicked the link but that's not even similar. That's the exact same thing.
by rowanG077 6y ago
Wow I was skeptical before I clicked the link but that's not even similar. That's the exact same thing.
- alisonkisk 6y agoThe general idea is obvious: a (literal) litmus test. The details are what make it work, including availability of cheap test materials.