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Knowledge Based
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Copyright 2020 Cogni, Inc.
Interesting stuff for the mathematically curious:

We have built an interactive Bayesian statistics based calculator
for % chance you have COVID-19 antibodies
if you have a positive test.

Before clicking, answer this:
If 5% of the US population has COVID-19 antibodies,
and the antibody test I am administered is 90% accurate,
what is the probability that I have COVID-19 antibodies
if I receive a positive result from my test?
Here is the Calculator
Capturing and Distributing Expert Knowledge.
Note about our online curriculum planner for K-12

Update:

With COVID-19 disrupting schools, we have been working to ready a
state or region-wide pooled version of our Curriculum Planner
available to districts to allow for pooling of content across districts.
More detail here: Online Curriculum Planner