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FREEZE AND FLEE  Narwhals, mammals known as “unicorns of the sea” for their single tusk, have another oddity: Their hearts slow to near-arrest during frantic flights into the deep.

Aedes aegypti mosquito

SCENT OF A HUMAN  Nasty experiences can change an Aedes aegypti mosquito’s inclination to follow certain odors, such as the whiff of human skin.

amyloid-beta buildup in mouse brain

BRAIN BUILDUP  One of the changes to brains with Alzheimer’s disease is the buildup of clumps of a protein called amyloid-beta (red) among nerve cells (green, mouse brain shown).

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