- One may define life, to the extent that the question makes sense, as a 'far-from-equilibrium dissipative system,' says Charley Lineweaver;
- An enzyme called peroxiredoxin (PRX) has acted as a biological clock in all organisms since about 2.5 billion years ago;
- 86 million year old mud 30 metres below the sea floor contains archaea that take hundreds to thousands of years to go through one division.
19 May 2012
Boundaries and thresholds
Three shorts on: widening the definition of life; finding what may be the first biological clock; and locating what may be one of its outer edges: