As Europe sees record coronavirus cases and deaths, Slovakia is testing its entire adult population. WSJ’s Drew Hinshaw explains how mass testing in the small country could help control the virus without strict nationwide lockdowns.
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Is tilapia a human-made freak that we should avoid — or an evolutionary rockstar? 
Viewpoint: Should you be concerned when you read that a chemical in your food has been linked to cancer? Here’s an epidemiologist’s checklist to detect over-hyped scares 
Viewpoint: By engineering block on Vitamin A enhanced Golden Rice, Greenpeace ‘puts the whole environmental movement into disrepute’ 
Why you may soon be shopping for tomatoes enhanced with snapdragon flower genes 
Embryos aren’t female by ‘default’ after all, study shows 
How Freddie Mercury got his voice: It wasn’t his teeth 
Dissecting claims about Monsanto suing farmers for accidentally planting patented seeds 
Viewpoint: Sri Lanka’s ‘tragic’ legacy — To encourage sustainable farming, countries cannot ignore food production and socioeconomic trade-offs 
‘Golden blood’ is incredibly important to medicine — but for the 43 people worldwide known to have it, it poses a unique danger 
How common is incest? Rise of genetic testing reveals disturbing evidence 
