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Explore the most exciting new ideas and emerging concepts in science, health, technology and the environment with New Scientist鈥檚 exclusive in-depth articles, interviews and long reads.
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Explore the most exciting new ideas and emerging concepts in science, health, technology and the environment with New Scientist鈥檚 exclusive in-depth articles, interviews and long reads.
As natural as kissing seems, it also means swapping mucus, bacteria and who knows what else, so how and why would such a behaviour evolve?
Looking at our neighbouring planets, you could be forgiven for thinking that if they do belong to the same family, it is by adoption rather than kinship. Not so: they are blood siblings