More people are moving out of the U.S. than moving in for the first time since the Great Depression—a bad omen for the $38.8 trillion national debt

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Besides, US oil firms have been bitten by Venezuela once before. In 2007, major US companies including ExxonMobil and ConocoPhillips had their assets seized when they refused to allow PDVSA to take majority control.

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Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.