Amazon begins temperature checks and will provide surgical masks at warehouses

How are temperature checks useful? I thought I'd read that people are asymptomatic for up to 2 weeks, during which time they can spread it. If that is the case, temperature checks do absolutely nothing to stop the spread here...

I am seeing this logic a lot: “this preventive measure isn’t 100 percent perfect, therefore it’s completely useless.”

Even measures that are only partially effective can make a substantial difference, especially at a population level.

I get the feeling a lot of HN commenters would recommend against condoms because they're only 98% effective, and only if used correctly, therefore completely useless.