Flamingos, hydrangeas, leaves and eggs

Did you know that when flamingos are born, they are grey and their feathers are naturally white? Then… why do they display that pinkish colour? And hydrangeas, why do they show different colours? What do flamingos and hydrangeas have in common? And about the leaves of a tree…why do they change colour during the year? Did you know that eggshells present fluorescence? And finally, what do all these questions have in common?

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Mirror, mirror on the wall

–  Who’s the fairest of them all? –  But what if the mirror had not been as clean and bright as it should have been? Neither the Queen nor Snow White could have asked the magic mirror that famous and memorable question. Mirrors have played an important role in films, not only in ‘Snow White and the seven Dwarfs’, but also in some older such as ‘Taxi Driver‘ or ‘The Shining‘ and some recent such as ‘Harry Potter and the Philosopher’s Stone’ or ‘Black Swan’. Even Justin Timberlake dedicated a song to mirrors! What would we do without mirrors? We could not even know how we are or look like (or how we dress)!

But what happens when a mirror gets old? Why do mirrors grow old? Let’s find it out!

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DNA: much more than the molecule of life (I)

Changing the subject from my last post, it’s time to talk about DNA and the recent discoveries related to it. Let’s start with the most simple question.

What is DNA?

Deoxyribonucleic acid (DNA) is the biomolecule that encodes the genetic information of cellular¬†organisms. It is composed of four molecules called nucleotides, which are represented with a letter: adenine (A), guanine (G), cytosine (C) and thymine (T). Continue reading “DNA: much more than the molecule of life (I)”