IT has been assumed that there is only one form of fluoride in serum, the inorganic F ion. It would therefore seem that either the value for serum fluoride which I found (1 µM) (refs. 1 and 2) or that ...

Tehran has rejected Donald Trump's claim that its leader has asked for a ceasefire, according to Iranian media. Earlier, Trump said he could pull the US out of NATO over its handling of the war.

In a world where there are more digital surveillance and threats to your privacy and security than ever, a VPN is an essential part of your security toolkit. Here's everything you need to know to ...

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