Alien

A chemistry educator has sparked discussion about whether Vulcans from Star Trek could plausibly have green blood while otherwise functioning like normal vertebrates. The question touches on how copper-based blood pigments, like hemocyanin found in some real invertebrates, could explain the fictional aliens' green circulatory system. Commenters are weighing the biology of oxygen transport against the franchise's long-standing lore about Spock and his species.

Donald Trump is returning to the campaign trail while some Republican candidates are carefully managing their positions on his policies, according to NBC News. The party is described as striking a 'delicate balance', with candidates seeking to appeal to Trump's base without alienating moderate voters ahead of the elections.