Red is the colour of many things. Roses. Stop signs. Brake lights. And those little cards that referees use in soccer matches to say you're out of the match.
And it is also the colour of blood.
That's not something we're always comfortable thinking about (especially if you have hemophobia—the fear of seeing blood). But it is something we accept as the truth.
Though should we...?
The true colours of blood
OWLconnected reader Aidan clearly had his doubts. He asked us: "Do all animals on Earth have red blood?" Good question, Aidan—we love a truth seeker!
So, what do you think the answer is? Click below to play the newest episode of General KnOWLedge At Home, and all will be revealed! The answer might surprise you...
And if you have a question that you'd like us to answer, send it to firstname.lastname@example.org. We can't wait to hear from you!