Question sent by TAMAR ARENAS (Belfast). PAU CARAZO answers: The quick and easy answer to this question is that men are actually not hairier than women. Two very different classes of hair

Question sent by TERESA OLIVER (Alcoi). EDUARD ESTIVILL and NURIA ROURE answer: Sleep and waking life are brain functions and are thus subject to changes of the nervous system. Sleep is neither

Question sent by VÍCTOR SOLVES (València). ENRIQUE FONT answers: Caudal autotomy is a defence mechanism against predators, and it is widespread among lizards and some snakes. Tail dropping is an effective anti-predatory

Question sent by JAIME LÁZARO (Manises). JUAN ANTONIO RAGA ESTEVE answers: Ambergris grows inside the intestine of sperm whales and thus it is part of its faeces. It is formed by the

Question sent by NEREA MILÁN (València). JOAN MAYOL answers: In medicine, the pathological ingestion of soil or other inedible substances is called «pica», and it has been observed in many animal species,

Question sent by GUILLERMO GUEVARA PARDO (Bogota). FERNANDO BALLESTEROS answers: Although raindrops are usually represented in the shape of a teardrop, actually, they are almost circular. When a beam of light enters

Question sent by DÍDAC COROMINAS (Girona). FERNANDO SAPIÑA answers: Both olive oil and drinking water are basically constituted by a specific type of molecule—triacylglycerols (commonly known as triglycerides) in the former case

Question sent by MARTA ARENAS (Valencia). GUILLEM PÉREZ I DE LANUZA answers: Certainly, birds do show a wider colour diversity than mammals. What’s more, colours in birds are brighter and more complex

Question sent by RAFAEL MESA MANZANO (Manises). JULI PERETÓ answers: That plants on Earth are green is not sheer chance, but the result of a long evolutionary history determined by the atmosphere.

Question sent by IRENE MAYOR SÁNCHEZ (La Vila Joiosa). DANIEL CLIMENT and ESTEVE SOLER answer: Tannins, complex substances inside the group of polyphenols that coagulate certain proteins, are responsible for the

Question sent by JOSE GALÁN (Alacant). EDUARDO ROS answers: «Clouds are not spheres, mountains are not cones, coastlines are not circles, and bark is not smooth, nor does lightning travel a

Question sent by COCO BROSS (Buenos Aires). JOSEP ROS answers: Even though this is a widespread idea, the hemisphere in which the sink is does not univocally determine the direction of the

Question sent by ROCÍO ROS (València). LYDIA GIMÉNEZ-LLORT answers: Even though it is a feature all vertebrates share —from the fetus stage to old age—, and in spite of the curiosity this

Question sent by CRISTÓBAL HERRERO (Màlaga). SERGIO MONTAGUD answers: This is a very interesting question. However, in spite of how fascinating its answer may be, I think this question brings about another

Question sent by Tomàs Ferrer (Castelló). LUIS TORRES answers: We have evidence of wine consumption, especially red wine, preventing us from suffering coronary heart diseases or even preventing cancer, since 1992.

Eating yogurt every now and then is healthy due to the lactic ferments that help our bacterial flora, especially when they are alive. But, don't these lactic ferments die in

The pain women feel when giving birth is a very intense one when compared to the pain females from other species feel. Why is this so? Question sent by ENRIC CABRERA

Conspiracy theories claim that the HIV was manufactured in a laboratory

Question sent by RAQUEL RUBIO (València). EDUARDO MARTÍNEZ TAMAYO answers: The burning sensation we feel when we touch some objects at low temperatures, and also the damages produced, are very similar to

Question sent by ALONSO SÁNCHEZ POLO. PAU CARAZO answers: Until the onset of puberty, when feminine hormone release triggers the development of breasts in women, the development of mammary glands happens

Question sent by JOSEP MONFORT (Castellón). ALBERTO MARTÍNEZ-ORTÍ answers: The formation of these clusters, sometimes formed with many specimina, also called "grappes", is a strategy land snails use to fight the

Question sent by REMEI CALABUIG (Albaida, Valencia). EDUARDO MARTÍNEZ answers: The burning sensation is a sensory reaction to a process of heat transfer from a heat source —whether a piece of

Question sent by NURIA MARCO (Valencia). ESTER DESFILIS answers: Although it may seem strange, fish can smell and, actually, they have a very good sense of smell. Many people think that