What are the symptoms of chicken pox and what does the rash look like?
A new drug for advanced prostate cancer has shown promise in early trials experts have said, with the medication shrinking tumours in some patients.
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"I just think it's kind of a dangerous precedent for social media companies to request 3D scans of your face or official documents without there being any kind of knowledge of how that information is being protected or stored," he tells the BBC.
"Yes, we'll help you celebrate your 250 years, but you should really help us."