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Planetary Science

Readers contemplate water on Mars and more

Readers had questions about the significance of finding water on mars, air pollution from wildfires and spray-on sensors.

Health & Medicine

A new vaccine raises hopes of someday curbing the tuberculosis epidemic

A new vaccine for those infected, but not sick, with tuberculosis reduced new active cases by 54 percent, compared with those given a placebo.

Math

Here’s why we care about attempts to prove the Riemann hypothesis

The Riemann hypothesis could hold the key to understanding prime numbers.

Animals

This new fish species displays a splash of highlighter hues

Researchers stumbled upon a new species of coral reef fish with spectacular coloration and a unique habitat.