On Regulatory Approvals

 The UK has approved the Pfizer vaccine for use; the FDA hasn't yet.  Some, like the Marginal Revolution blog, are critical. 

The FAA grounded Boeing's 737-Max for 20 months, before approving it this month. 

These are judgment calls, or actually likely a nested series of judgment calls in each case. 

There are some of us alive who remember thalidomide, and the British Comet.

I'm not one to second guess bureaucrats who have to make judgment calls with life and death consequences.