A new breakthrough allows children to have "three parents." A look at the ancestral creatures that gave rise to the first mammals. And an astronomer examines whether Elon Musk and SpaceX have what it takes to bring us to Mars. It's Earthy Thursday, our weekly segment on science and Earth-related news! All this and more for the Pagan News Beagle!

One man, one woman. That's what it takes to make a child, right? Normally, yes, for humans that's what it takes. But it's not the only way that's possible either in the animal kingdom or, now, for humans. Jezebel takes a look at a new technique that would allow a child to technically have three parents: specifically two mothers and one father.

Rural living has a reputation for being green. But when it comes to industrialized communities, often denser is better. Which is why President Obama is campaigning to make cities both denser and greener. Environmental activist site Grist has more details.

We may seem pretty different now but once upon a time, our ancestors and those of lizards were kindred. Scientific American takes a look back at one of the synapsids, reptile-like beasts, from which modern mammals are derived.

So far 3D printing, despite its radical promise, has mostly been the obsession of hobbyists and artisans. But now, the medical field is looking to give the technology a try. Discover relates how 3D printing could lead to better treatment for broken bones and fractures.

A week ago Elon Musk, famed industrialist and engineer, announced his plans to send millions of humans to Mars by the end of the 21st century. His plan was bold, audacious, and perhaps more than a little improbable. But improbable doesn't mean impossible. At Slate, astronomer Phil Plait outlines how Elon Musk's plan could become a reality as well as what challenges await him.


Top image by Dmitry Bogdanov