Frustration inspires innovation (part one)
08.27
Instead of blue mountains on a cold beer can, why hasn’t anyone come up with a lid or sleeve for a coffee cup that tells you when it’s no longer so hot that it’ll burn your tongue?

Seriously. Because the sip test is dangerous.
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Update: Apparently someone has invented it.
http://www.smartlidsystems.com/
Next question is why they haven’t taken off.