Tooth loss in birds occurred about 116 million years ago — ScienceDaily.

Earth faces sixth ‘great extinction’ with 41% of amphibians set to go the way of the dodo | Environment | The Guardian.

Revealed: how bacteria drill into our cells and kill them.

Human DNA Shows Traces of 40 Million-Year Battle For Survival Between Primate and Pathogen.

Stem Cell Treatment to Repair Torn Meniscus ‘Very, Very Close’.

Researchers show how stem cells are reprogrammed, should spur treatment discovery.

Scientists recreate what may be life’s first spark – Nation – The Boston Globe.

Is preventive medicine its own health risk? – Aeon.

Want to eat like a teenager again? McMaster scientists may have found a way – Latest Hamilton news – CBC Hamilton.

Mars Rover Finds Stronger Potential for Life – NYTimes.com.