Covering the most important news for your brain you may have missed over the last few days.  Here’s a quick rundown of this week in science . . .


1.  Geologists in Australia found fossilized microbes from 3.5 BILLION years ago.  And it’s the oldest signs of life on Earth we’ve ever found.  Before this, they weren’t sure if life started that early.  Earth itself is about 4.5 billion years old.


2.  Obviously too much working out can make your body tired.  But a new study in France found it makes your BRAIN tired too.  Hitting the gym harder than usual can cause mental fatigue.


3.  Researchers in the U.K. think they’ve found evidence that babies were using sippy cups as far back as 7,000 years ago.


4.  Scientists at Northwestern and Columbia built a tiny laser that’s 1,000 times thinner than a human hair.  And they’re hoping to eventually implant them INSIDE people’s brains to treat things like epilepsy.