Instead of indulging, she carried around a cup of hot liquid, be it coffee, tea or chicken broth.

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Astronomers call the most promising of these places "Goldilocks planets, " because they orbit in a temperate zone not too hot and not too cold to support liquid water essential for carbon-based life as we know it.

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Dollar retailers are hot among value investors, who find their liquid inventories and low margins attractive, compared with larger big-box discount retailers in the U.S. which must contend with food inflation costs and competitive pricing.

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For instance, the ultra-thin layers of graphene (a two-dimensional form of graphite) are formed by injecting liquid solutions containing carbon and silicon into an extremely hot, ionised gas (plasma) of argon.

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