In the video, which @bowaledeen posted to Instagram, a woman is seen asking her partner, "What is half of 4 + 4?" The man answers sharply and seemingly confidently, "Four." The woman, on the other ...
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 ...