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Although nearly all spiders are venomous, a few stand out from the crowd for their potent toxins. So, which spider is the deadliest in the world?
Strange sea creatures called ctenophores have a fused nerve net where scientists expected to see synapses. Did they evolve their nervous system separately from other animals?
Twice-reflected sunlight subtly illuminates the dark limb of the crescent moon just before and after the new moon in a phenomenon called Earthshine, or 'Da Vinci glow'.