Mars suffered early loss of most of the atmosphere

When I was a young man with less than 500 million years ago, Mars suffered a catastrophe that hung its magnetic field, leave it exposed to strong solar winds and caused him to lose most of its atmosphere. This is the most plausible story for children on the planet, according to the latest findings of the rover Curiosity.

The conclusion is in two studies published today in the journal "Science" that reveal with unprecedented precision the composition of air on Mars.

A study warns that sea level may rise 20 meters by the end of the century

The ice of the Antarctic "is much more sensitive" to climate changes than estimated, according to a scientific study which says that sea level could rise 20 meters to the end of the century if this area, the West Antarctic and Greenland, were to melt as in the Pliocene.

These are two of the findings of an international study published in the journal Nature Geo science, led by researchers from Imperial College London and Spanish participation.

Chemically induced pluripotent stem cells

Scientists have been able to reprogram the mature human stem cells, using only the chemical compound (without genetic manipulation).

A new method of obtaining cells are as versatile as embryonic stem cells, reduces the risk of developing cancer or of mutations that can occur as a result of stem cell therapies, "reprogrammed" with the introduction of additional genes.

Since then, in 2006, it was announced the discovery of induced pluripotent stem cells ( iPSCs ), scientists have sought to reduce the number of additional genes required for such cells. But it is always required at least one encoding a protein Oct-4 .