As it’s Halloween, it’s time to revisit some incredible facts about blood…

It takes less than a minute for a drop of blood to travel from the heart, through our body, and back to the heart again ❤️ While your blood veins, arteries and capillaries are 100,000 km long? That's twice the circumference of the Earth! #BBCIdeas #Blood #Science Subscribe and ???? to the BBC ???? https://bit.ly/BBCYouTubeSub Watch the BBC first on iPlayer ???? https://bbc.in/iPlayer-Home All our TV channels and S4C are available to watch live through BBC iPlayer, although some programmes may not be available to stream online due to rights. If you would like to read more on what types of programmes are available to watch live, check the 'Are all programmes that are broadcast available on BBC iPlayer?' FAQ ???? https://bbc.in/2m8ks6v.