Francisco Hernández En Salud y cuerpo humano

Why do we have wisdom teeth?

We evolved from hominids that had longer jaws for chewing raw meat and plants. Extra molars are an advantage, but they d…
Francisco Hernández En

Can an organ be transplanted more than once?

Yes. Sometimes patients will receive heart or liver transplants but die anyway within a few weeks. In very rare cases, t…
Francisco Hernández En Salud y cuerpo humano

Why do we cover our mouths when startled or shocked?

Not to prevent our souls leaving our bodies, as some traditions would have it. The gasp which causes our mouths to open…
Francisco Hernández En Planeta Tierra

What caused the Big Bang?

The big bang is the moment that space and time (or ‘spacetime’) came into existence. Before the Big Bang there was no sp…
Francisco Hernández En Salud y cuerpo humano

Why don’t we sneeze in our sleep?

During REM sleep (the phase where dreams take place), your muscles are paralysed so that you don’t thrash around and hur…
Francisco Hernández En Planeta Tierra

Have we made any difference to climate change yet?

Quite possibly – but not in a good way. The principal drivers of climate change are greenhouse gases that trap the Sun’s…
Francisco Hernández En Planeta Tierra

How big could an animal get?

Based purely on the physical strength of bone and muscle, it has been calculated that land animals of at least 100 tonne…

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