But to what extent varies a lot depending on the specific genes ... but for most adults, you should aim to get seven to nine hours a night. And try to have good “sleep hygiene” by going ...

They further postulate that many of the physical traits that we consider attractive are signs of physical health and fitness—in other words, good genes to let swim in our pool. Science has also ...

What happens when good genes go bad? What kinds of mutations create "lethal genes," and how are they passed on? Lethal genes can be recessive, as in the aforementioned mouse experiments.