Letters to the Editor

Life

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Readers discuss Dulles' microscapes exhibit, baby birthweights and what should be done about the triclosan problem.

Psychology

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Readers way in on slacktivism, cockroaches, dinosaur tracks and more.

Science & Society

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Readers discuss mammograms, crops in a warming climate and the impacts of a recession on developing personalities.

Neuroscience

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Readers weigh in on marijuana legalization, twisted twists, high-kicking frogs and more.

Astronomy

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Readers debate about what happens when an astronaut falls into a black hole, compare note-taking techniques, speculate on bat longevity and more.

Animals

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Readers discuss mammal milk, ancient human genetics and hand washing techniques.

Astronomy

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Readers discuss the speed of spinning particles, what defines a planet and how to see invisible shrimp.

Health & Medicine

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Readers question pertussis vaccination scheduling, share stories about earthquakes and more.

Cosmology

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Readers weigh in on the Hubble constant, temperature extremes and heart screenings for student-athletes.

Climate

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Readers discuss the influence of clouds on climate, how to treat addiction and which human-made hazards are the biggest bird-killers.

Genetics

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Readers ask about Neandertal genes and electricity-generating spores and react to a fusion milestone.

Planetary Science

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Readers respond to a special report on neuroscience and discuss moon dust.