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Genes & Cells

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environmental exposures

ENVIRONMENTAL EXPOSURES  Things people come in contact with every day, such as pesticides, chemicals in water, hormone-mimicking chemicals in cash register receipts, smoke and air pollution, can change chemical tags on DNA and proteins. What those changes mean and how useful they are for determining health risks aren’t yet clear.

bubbles

TINY BUBBLES  Cooking up Earth’s first life probably required many “pots.” Spatial segregation into different pools or separate droplets might have helped the first self-replicating molecules survive. Later, protocells like those shown here provided more stable compartmentalization.

macaroni penguins

MISMATCHED OFFSPRING When macaroni penguins convene at a breeding site (shown), females lay some of the most size-mismatched eggs known among birds.

Genes & Cells

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