Posts Tagged 'earth'

The origin of trees

The great  Richard Feynman was a nobelist, a philosopher and a great teacher. In this video he explains how trees are created from thin air!!

 

 

This is not intuitive but it is -of course- absolutely true, and a wonderful example of the difference between learning (that trees get their material from CO2) and understanding (*Air* is transformed in to a living tree). Also a testament of how, the beauty one can see in the cosmos, is enhanced with the better understanding of it….

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Liquid water on the surface of Mars

It was earlier this month confirmed that liquid water was found on the surface of Mars. This mean that two things have just skyrocketed :

  1. The chances that we will find life on Mars.
  2. The chances our mars missions contaminate the planet.

The second one is what we should worry about: Life on Mars is or Life on Mars isn’t. Nothing we can do about it. But the notion that we can destroy it by mistake is really scary.