The 1:1 ratio results from the way the X and Y chromosomes are doled out in sperm and eggs. We know that boys and girls are produced in much the same frequency. But how – and why – is this 1:1 ...

Please verify your email address. X (formerly Twitter) is changing its block feature to allow blocked users to still view posts but not engage with who blocked them. The new block function aims to ...

Andy Tattersall does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations ...