Evolutionary theory predicts that reproduction entails costs that detract from somatic maintenance, accelerating biological aging. Despite support from studies in human and non-human animals, ...

Birds do it, and bees do it. Indeed, researchers estimate that over 99.9% of eukaryotes reproduce sexually. What, then, are the true costs and benefits of sex? Yet again, this simple example ...

If you’ve ever had a spiny leaf insect as a pet, or you’re considering getting one, hopefully someone has warned you about this: if you put one in your enclosure, you might come back some time later ...

In flowering plants, the transition from cross-fertilization (outcrossing) to self-fertilization has evolved repeatedly across species. This shift is often accompanied by a well-known set of traits ...

A study has found that the reason why the evolution of the first animals to appear on Earth was delayed for over 10 million ...

In a recent and historic breakthrough, scientists managed to reproduce rats without the need for male sperm, an important milestone that opens the question about the future of genetics and the ...

Although some people still think of fertility as a "woman's problem," in 20% of infertile couples, the problem is solely with the male partner. Infertility in men may be the only reason that a couple ...

Who needs men? A female shark separated from her long-term mate has developed the ability to have babies on her own. Leonie the zebra shark (Stegostoma fasciatum) met her male partner at an aquarium ...

It seems paradoxical: embryos formed in microgravity initially show increased vigor, but then encounter growth problems. This discovery raises questions about the possibility of reproduction during ...