BBC Earth (Asia) - - Contents -

How old is dys­lexia? Where is the cen­tre of the Uni­verse? What is ex­otic mat­ter? What’s the speed of thought? Why do as­tro­nauts al­ways use white suits?

The sex of a cater­pil­lar is fixed at the mo­ment the egg is fer­tilised, but most species don’t show any sex-spe­cific fea­tures un­til they turn into but­ter­flies. The im­ma­ture re­pro­duc­tive or­gans are still present in the lar­val stage though, and in a few species with translu­cent bod­ies, you can see the red or dark yel­low testes of the males.

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