Iranian nuclear scientist Mohsen Fakhrizadeh was killed near Tehran on Friday. Fakhrizadeh was said to be Iran's most senior nuclear scientist and has been described by diplomats as the "father of the Iranian bomb." And, there was jubilation at the start of the week when the pharmaceutical company AstraZeneca announced results from phase three trials for a vaccine for the coronavirus. But scientists have been asking questions and are worried that the drug may not be as effective as hoped. Plus, we explore the spiritual side of brewing coffee. 

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