When humans counted on their fingers, everyone had a state-of-the-art (at the time) calculator at all times. But as we got smarter about calculation, we missed that convenience. When slide rules ...

If you couldn't get the previous ways to work, or you're using Safari (which uses wildly different extension protocols), you can install it easily as a bookmarklet. It will still auto-update, and it ...

The first calculator estimates the probability of experiencing a new AIDS defining disease or death by the end of 1, 2, 3, 4 and 5 years after the patient starts ...