Science of the Week, 1/11/13

Here's what I found interesting on ScienceBlog this week:

Dark energy alternatives to Einstein are running out of room

Tree seeds offer potential for sustainable biofuels

Get a grip--why we get wrinkly fingers and toes

First "bone" of the Milky way identified

Testing Einstein's E=mc2 in outer space

Engineered bacteria make fuel from sunlight

Exocomets may be as common as exoplanets

15 new planets hint at "traffic jam" of moons in habitable zone

Major cuts to surging CO2 emissions needed now, not down the road, study finds

That's it for now. Have a good weekend, everyone, and see you on Monday!